using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    static void Main(string[] args)

    {

        var markerEndPos = 0;

        var dirtyUntil = 13;

        var input = GetInput().ToCharArray();

        for(int i = 1; i< input.Count(); i++)

        {

            var max = i>13?13:i;

            var found = false;

            for(int j = 1; j <= max; j++)

            {

                if(input[i-j] == input[i])

                {

                    var newDirty = i+(14-j);

                    Console.WriteLine($"Match found between {i} and {i-j}.  Dirty until at least {newDirty}");

                    if(newDirty > dirtyUntil)

                    {

                        Console.WriteLine($"Setting dirty until {newDirty}");

                        dirtyUntil = newDirty;

                    }

                    found = true;

                    break;

                }

            }

            if (!found && dirtyUntil < i)

            {

                markerEndPos = i;

                break;

            }

        }

        Console.WriteLine($"First unique marker ends at position {markerEndPos}");

    }

    static string GetInput(){

        return @"bvsvcsssfwwdttzpzqqnjjmbbmpbmpmffnttjllzbblvlvqllcwwqpwwhcclqqhmhbhlbbmtmdmgmpggcmcnmcmfcfddvmmcncrcncbbtssdnnhmmfmfrmrbbzllgtllfnnwhwtwzwjjrsrgsrsbbnjjbhjbbjpplslrssdwswrrcsszpplpfplflnnvdvmvjmmgpghphlhphnhffgqgfgzgddstdsdjjgqglqggtgvgrrgtrtllrvrmmnggftgtdtrttgqttcrcqqjqcqwccdzdldrdbbbmrbbnmmwrmmbcchnhmhchddhpphdhzhbbnvbbtctwcwbcwcfclcwwzvwvddbsdsfftgtqggjllwjwppmvvswsjwsscdcrrbggqzqqbhhjwhjwjtjvttpnpdplljplpqpzqzrqrmqmvvsvrvppfgfzfqffvsfvfcvcddjcddzssgfgtffhtfhthntnvvzhzwhzhbbnvvbtbqtqcqnqwnnvpvwwcqcgqqwrwlwbwrbbjcbbqqpddtbddcldccddjssvnvlnnmggmbbchcdcqqdsdqsdqdvdpvvvbzvbvrrjdrjrbjbrbttqzttmffwcfcnnbjnbbjmmgtmgmgdgdpgdglgzzvnzzztjjwbwvvhbhwbbnbhbddwcwvcvjcvjjnnjqjqjzqjjbgbmbjjnqnqddgfgwfgwfftntvnvtvhvlvslsffhvvwnnhshchmmlwmmwvvnhnggzllphllbqqtgqqffhwwnwzztnzttftptnppdpjdjwdwhdddgqglqldqdzzslsggstsrrcsrcclqqrsqrqjqhhjwjggrjgjnjtjwtwjtjrrvnnbddzqzzfnnbvvmfvmvwvggmsgsrggcjjtftpfflzfzccdgcgzcgzcggrbgbngnpnfngfnfqqfzfbfsbfsslqsstvvfmvfvrrvdrddrlrjlrrngrrgfgvgdggnttqqjbjwbwwchhddpmmcvcppjttbzbrzrdzztgtrrchhhbnnqfnfjnnpncnbnvnfnwwsllvrvddhwdwndnjdjbjttmggfvggjhghrhggczgzttbnttjmmdhdrrnnmppwtwdtdbtdbdffpqplqqfbffjssllmwmnmffcnczzrnznzmmwcmwwpbpcbbfdfrrznnzwnnmjnngmngmgpgrppnhnjhhjnhjhfhbffcfhccvzccnrrsggtjtdtjjqqdmqqcggmzzrhzrrbnnlqqtlqtqhhcffrpffgcfgcgncgnggjgzgvzvtztctmtgmmfwwttrntrtqtptzpzjpjqjffpvffvdfvvjhhggfhfrhrwhhwshsnhshbbjzbjzzlvlfvffmrfffngfgpglgjjsbbvzzjsjvsslgsgsfggwjgjlgjgsjgsstvstvstsffdqdpqddrsrmmjbbqbffzbzjjvzvrvcvhhsjsrrmccgqqjnnplnnrprhppslsqszzpvzvggsqscqqbwqqccsdsswqswwqcqzqddbhhmggswggzllccwvwjjpqqrpplrprgrllfwfmwmhhcmmnppfffvtffndnsdnsnbsnsgnsncnzzwrrqrwwzhzbzbnbqbjjrhhjjjbcjjffmwffjnfjfbbjtbbjhjvhvshvhwvwhvwvwfwwwfvvlddqnnlttqssnpsprpwwttlwtwrwfflggvjggwswgwgtgccdjdtdldrdcdsspjpvjpvvfttjrjdrrjppddbdvdjdwdvdssrhsszsjzzfccmwcwzzlnljlppjdjsdjdhdttrdtdtvddslsmmjnmmhzmhhmwmvmcvclvlnndtdrrfdrfrvfvsfvsszfsfdsfdsfsnsdsnsbsddsdwwzbbfqqhrhmrmzmhzhbbpptptffvtvhhwqqtgtdthhrqrrvttprtprrbcblsmbwqqpffmwnqmrdwvjszzhhhffpqsphcgqhlmsgnmmjsdhbfjscztgfvhnlbcmccrfcbnrwcpvgzztvpjdplmncrbvpzwtdnpfwcpvcbzvbtpqmgztsblnchzlphtzgfqcwnrbpcdhbcgzsbgdmbhhrsjqcngfddwvwvldbftgccbjzrrqjcnhbdfgmpdhdgfqzmnpmjgtgwvqlbwgjzjppgmcjzrfzgnbjjbvmshllzjppscwjzjqnbvrppzlshfvtvnpwljrghhwdhfgtcrstnqtqdzfhvgbrrzfdwgtjpjccwrphsdrsjlrlbnrtdbnhpdtshmqlpjqjdlwvrrflwqhcmnsrmcdnfcnwwqmdjlqmqvpgggrjrvfwtwnmhrgzztvmnqczvgmvpcldgfwmtmnsvdshrjmtsgfstjllmqqmpttfhjnsjflcmnpqtqnvtpbgjjhlwqzmrgrbvcsjvprbtqdrnvrgfjdrlhdjsvhhzvllzgfbdwbtqbqzpllpcmcdrfmrsfnwvvmhcqjblnczltcmmmbqwpztqmdpprwphfwgwnsvnzsldnvbsbcdprnztpbmlfzcwpdvcwbsdflrcvsqlswctvlpvshqpwvtcjbtfnmgwtgsvtqhqdzzfhwznggpsmsmzlzrzqcdbqcnhpwhjbhvnqrcwnvpspwqmsqhdbchgrfcmznchwvftgvbldnvtpgmthbmpvccqwbjnjpzhrstscncsrdzsptzvlzjwnpzshmzbhrhgmnwmjmzvvvbgdjshgnqcmdmjrnhqzwtzpjvdczqzccvpvpqnftvpcwgzrzmmnhjnphfntbgjnscwqjcgfcrhjdsjbqfgzhsftghwwwvjwmhfhbwrwmnfrhcggcrjtjsqndrgsbvddqtwhctltzswmtsgwjgsbvvsvzfhbptjqbvbblzhcmnpcjpgzfhstsnlfvmqbdjhszhwhbqztvfdhnbnmppwvzjpnrhtbgthrdprjpqwpthqwzdnhpngflcmhnrmsbdlfwhjbfgrhfzspmfvvtqrwldzvblbtlwqfgfflvmvthbvdzzbtmmpzchgmldmgnhrfhhjwstbqqrzhmqsbqhjzdmjmllmjgqhhjghgsvrbmrbfjdzghmwpszfmslfwcjrftbqjgbbzddtvjmsgwmhhdzwtwvrgqctvwbwjqvssdvfprjsdgsgwbfmzwzmbnlzbfdqvwbrzpgvngqhfqzfqqsvmtgvsqwrplhfnsqhtvtbbqmpbjlcsfjgngwrztlrjbmcjddjsnbgcpnhdtngzhzvhzpjfcblhglhzfsjdgjdqvvppfrdftfbfldwqjznvrdqdnfscgvhztjwlqgqbjmlsbcrldjhnrsfgthlhplvwgmdnplrtpdvrqbpvnbpzfzwlvrrscvmgzhlcdwglwwrgzqsjqsqfblqljltbvvjwbpmfqjvldspgsbjrdbbwzjntlpqgvdjfvsjznczsppzwfvblffqqhwmhzdzztbvbsjhvjtjrptrdvrbbpnpncltqnhdvwjgzcmdtnbnhlmptjsqlzlpztnrtclgsmgvrvggtzfhpwgjgwtrnshmcpvhprpnrvgprspmwhchlhhsvwpvjdmjrlnjdchngrdgpwzsgqsjnqnqwsctzvsmqgvrpffffcfshbhmqbffwvcjqscrwhbfflwslspwjgdbvcgbtwldzffrdhrlbssjbcsjgbhprgspnjdbmnshzqwdvtnzsrfwbqfrgnlmpvqrrmmmcshzltqbwffprbwqbfthtvszqzcbbljtfjqmwpqssjtdpqlrfmpchrqmdpbsdjcdmglnlgnwvhclqfmbwhtljmscnzzqtwtjqsqrmmnssmqhqjvdlpmstmpwmrcfjbjrchrgvqqzbvtzpcbdvchvghnflllqddlttjwtnfhgqjjgtgsnhpvnwhcbljstshmhpwbqthvngqzrmqpmwqnvrfblpjlqgczfmtwvmlbzslqwdzhfccmrvjwfnwzgpbvgdgttdgtjdlvrmpbdhwjsvvsjqpclrnbtzphvmpfqhhqdmbmqzwphnzzfqjsqvdvbvnpmtnzpdsfzmbttssnssrtpmpvgrrzvcljtqtrqnfmmtsnvtrsjgcmqnttcmp";

        //return "mjqjpqmgbljsphdztnvjfqwrcgsmlb";

        //return "zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw";

    }

}