diff --git a/Cargo.lock b/Cargo.lock
index 6433955..4b9ebb2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,6 +6,7 @@ version = 3
 name = "aoc-vv"
 version = "0.1.0"
 dependencies = [
+ "itertools",
  "num-derive",
  "num-traits",
 ]
@@ -16,6 +17,21 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "either"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90e5c1c8368803113bf0c9584fc495a58b86dc8a29edbf8fe877d21d9507e797"
+
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "num-derive"
 version = "0.2.5"
diff --git a/Cargo.toml b/Cargo.toml
index 70b3943..06f6a9f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,10 +2,11 @@
 name = "aoc-vv"
 version = "0.1.0"
 edition = "2021"
-default-run = "p05"
+default-run = "p06"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 num-traits = "0.2"
-num-derive = "0.2"
\ No newline at end of file
+num-derive = "0.2"
+itertools = "0.10.5"
diff --git a/etc/p06.txt b/etc/p06.txt
new file mode 100644
index 0000000..1daaf7d
--- /dev/null
+++ b/etc/p06.txt
@@ -0,0 +1 @@
+hlfhfzffqnnrlnnvnmmgbgwgttbppcrcnnmdmfdmmgwwrrqnrrscrctcbttvcvtvvhchjhccjgjttmddplplqplqlbqlblrrbrvvprpffpmmzpmpcczjzzbwwfssvrrvggncgncgcwczzswwqqjjflffpwfpwpbwpwpdpbpvvqffcfcjffjllncczfzzmhzzmddgdrgrwwjzzdjjsnjsjfsjsjhhcchlccchqchhzzpnngdgndnpnppsdsggbvgvgpprqrqmmlzmzllvrrcvclcwczcqqcdcfcqqmmzbzdzdjzdjdmjdjzdjjcvjvcjvcvssltstttfbtftrfrlrdllrqqfssslccjdcjdjfdjfjqjnqjnjnrnddtnndtnnztzqztqztqzzpmzmggzrgrwwdqwdwcdwdnnmlmgmtmtstwssbffcnclclnclcjjcjpcpqcpqcpqpmqqfccpcjppnspsnnzggnpntndtdqtthwhnhwnwllzhlzhlzzghzghhlhvhwhjhfjjcnjnvjnjvvqccdmmgddllnmnrrdtdnncggfhgfglfgfmfnnpvvggznnwvnwwfgghrrfwrwzwszzzldzdldhlhblhblhbbbgjgsjggmqqmrrzggrhhwpwdpwdpwplpgpbggtssqffbqfbqbnnsqnqfnngcnnmwnmnbmmmslsjllbtbbpllltzzhgzztllsdllrvvhvjvbbhcbhchmchcctbcttvccgwcwpcchrcrdrdggcrrntrrfllcffbdfflrrrgbgrbbbdqbqjbbgbgrrqwqtwqwhwghwhzwwcswsnwnqqjhjhwhfwhffdfgddgjgsjgjhgglhlwhlhssfqfhhdmdnmnppdcddfzzhmhqqntqnnjvnjvjddcvcgcbgbbpjbjtbjjfgftgffplljfjrrhqqpddlssrvsrvrpppsllsdsqqqzzfttqsqzssjbbrnbnnrbbsrshsrrshrhwhbwbrrsrfrttfqtfqqfddvrvjrjvjsjhjsjdjqdjjlqjjjgcjcmcncfcrcwrwsrsslffzszmsszrsssrnrjjvbvpvcppptbbhhrddbcbggbqbmmsqqwggfpfbblmldmmpmwpwfwjfjsjnjmmpllccjzcjcwwpswshhpthhzchctcbcrrrrmvrvrdvvjmmvgmgwglghllvmllzlzzsvzzrmmhnnsjnnpvpwvpwwmvwwdqqdffhhhmccfgfvggchcctrrmdrrhrhnhnzzgpzzgttnhthvhzzqvvvwpwqpqdppsnnrgnnhphphmhcmcrmrvvqlvqqsccqhchzhwwmvmzmczzgsgdsggthgglrlnrlllbdllhwlwltwwcswsgssbhbsbvsbsbwbhbnncrcllttbrbppjccfpfhhgshschsccmrcmmcrrrzvvrcrggmwgwjwnwjjbffjddjnjgngqgdgnndznndvvfqfgfvvrvqrvvpllnsszbsbdbbdzbdbzbqbzznrznzjzpptcptccvwccfscffrftrrsnsvvswvvhbhzzfbzffncchhcnngzzcpcmmfttsntnjjsccqbcqqmzzgppdhppdtppmffgtgvvlzlpptdtttdppqjqtqctcrrzsswwtnwtnwnqqvbbdgjhvmmzpnhfvsbddzhgdwcnfdstvhhbzlzcfjwhlptbhmbmblprtsdmrdhbbbwpplnzgdnrzjmgzgpqbggnqvwwtntzgfwqrztqtdrsnhpfzswptggnvbszdcrmrhhtlrrfnpqrnpwrbmhlfwmdqqdbqrwbzqjbzwrgmbgrtzrhdclqfgsrtsgfwqrnnqgwsncmpgffggssrqvwjlhpsghbqdtzwmvzzvcmzsjqvprvcqwqjbcqcqrhpwwcsrscgmfdppbgvmnrdfrppblznbstnjzwwgstjvtprjbhtpdfgrhdjnjmnlbfwggzhcngvcwvcfpcwdtdppwjrdzsnjlnrzbfqqshlnzvwsmscgpfwjzhtwgfwgzdhbdwwzbsmfwwbmvrlrpswnjlmfbfzhwvcmgwfzssmmtjlwtrpwpwgnspbgchdncbfcpjsvtzjqtwqwjwgbhrbwvhqbcstsgsnwsjmhrlrvzgqhqfrmnrjdrhdjwcwctpdrzctlvnfzmzwhsnfprlzgzjpqvzchlmvbhffhpfjtvsdbvbdmwgvmqpflhwwndbqthmmwshdtspsrvqdflmmzwbqbqmpfdwjmvpbzdnqzfmhzdgldqjjvgpfcqftvjzwnzmfqdggrwlfzdhjnhmtrjbnllgqpntwmhnwtglnqdwbqdblpwnnrdwzpsqzfwqcmhqhnpsdcwvdldphgnrtqzdbnnzdzfttldrqcztlvlrgpdqzrcthslmtqhfvbzrfgnlrprcpbsctqhspbhnjtzrzhqjzszbzdthttqmbznzssftztwlggmdqqdtfllqjzjtvpgjfhtbwtbmtjplqnbdmsvlnqcwtdbdvfjnzgsmpnhbvvwwfbrgffjqfsccdjdwvbsdhqwfzvcpjzjbdjgrdctjplhwbdhhnbnwstvndnnwtsgbhzbvwdshvmnbwsthlrggtmddvjbfzfrnrdrqfjpslrccctzpjbwpdbhlbzfmwbltcqfngdprvfhgcszdtpnrcpdmllfnlspgrdrpwqmqbmrglvlrsmrfqrtzzgjcvqtqzpmghjrvmdmvvqztrjzbzjwdqsmrwpqnswbzhjbzzhdvmnfdsztzdzrjssgnnfqvbtsqrrmcppjgrmnstrnrlwjvvcczqlcbmwqzdfpssfwdfrvwtstwchdgwtrhhcmppcqlmrqlnwqccfphsdhbsbmtjvpcwwjrmrllbpnrmpbvwgwbftpdpphccwqcblcnvvbbppscmnjqgddllbnbvmmqzdffrrjtqwllzgpqrmnlfqrptzqmdmnrfnjpvqvjbsqrhljslgqqcqqtmtbwjrpphtjgjbqpzmzrzjrfjwcdcnbsjfljclffjplnrrcfbmhphtcjrzlrvvjcznpgpnrdwwqvgnbnzqnlcghhgwvhqbvjzfbdvhrzlqfbtlqhpltfjlfpbnjbphmmpntzqgjmwjtchwmlwvfjmfflqzpqnvvrgnbddzlfpdpdjghfgbsfddjspnfdwvqppncmdgfrnvrpcrflhgjgbwdsbwblfcwbtlrrnjjdhbvmrzgsvjwgfnnhqfbvhprlmwwqgclzlbqbrdspcbhftmdscsmpwrggrmnsvjphjmzmmrlrhnmdhwjlbmjchtvsrcplfspsssjznmzcrqnsjjtwjzvlhshbptqwwvjhjvzrhphphsbphpnzpfbwcdnqrhrrvlrwrztlpqnrcfzrncsvpzqzgslrlrwhvtgjmfncldqmvshlmnlpqbgvnwqfcthgrgllmqrjqmfgznspgltpptglpdcvhtzsprprbldbzhbmjsqzwvjggwhsczltcvgwqhspzpzvljwqjgrgtwswjdswlzjzslrsslvqzncjwhbbjpbdthqpgmhfglggmlrgwdsplgscrwstntvrhjzjjlshtgmnnhvsjwfmcjbpzjcstmnpvtbgrfcfdwjljsrfhdphrdcslwhgvlnwltwchplvfzntfgcnlsvzrvnnczhhqdlwjvqprhmtjdtwmppffmszzzqtfrgnhnzqgqzhrjzgntcszstrfhhtptgvswvzvjcgcntmhzzmdgsmtgzhpfvqfnwmsjdhtfgmmbrrfsdlptchqqzqdqjncmtpznfssrcnmcdnthglmfzsfgltrndqsfmdftmfgchbwmzgrtjvgqtshlltthnnpqnzfrchzhdzrrnpzvfzblrmhwdwjnqdptlbvndmmlhzhvsfdlmlhqrgqqzsdqtpczwcrwcbsftvvphfbwjrvrnrcqbbcsqgnhltwzvllljcvpwjgslbmngcdmpdvjlgcnrzwqjdgrblncpqmrgjmpqjzvdmcmwfnwqlszdgwqdfznhsnpsjrfwrqpqmpvhstmzgqblfmcfvwljbhdfhdmqcvrwnqcstwtzgmng
diff --git a/src/bin/p06.rs b/src/bin/p06.rs
new file mode 100644
index 0000000..b4d7a07
--- /dev/null
+++ b/src/bin/p06.rs
@@ -0,0 +1,32 @@
+#![feature(iterator_try_collect)]
+
+use std::{fs, collections::VecDeque};
+use itertools::Itertools;
+
+const START_PACKET_SIZE: usize = 4;
+const START_MESSAGE_SIZE: usize = 14;
+
+fn main() {
+    let filename = "etc/p06.txt";
+    let string = fs::read_to_string(filename).expect("Can't open file");
+
+    get_unique_marker(&string, START_PACKET_SIZE);
+    get_unique_marker(&string, START_MESSAGE_SIZE);
+}
+
+fn get_unique_marker(string: &str, len: usize) -> Option<usize> {
+    // starting with naive solution.
+    let mut vec: VecDeque<char> = string.chars().take(len).collect();
+    let num = string.chars().skip(len).position(|c| {
+        if vec.iter().unique().count() >= len {
+            true
+        } else {
+            vec.push_back(c);
+            vec.pop_front();
+            false
+        }
+    })? + len;
+
+    dbg!(num);
+    Some(num)
+}