You are given two strings stamp and target. Initially, there is a string s of length target.length with all s[i] == '?'. In one turn, you can place stamp over s and replace every letter in the s with the corresponding letter from stamp. For example, if stamp = "abc " and target = "abcba ", then s is "????? " initially. In one turn you can: place stamp at index 0 of s to obtain "abc?? ", place stamp at index 1 of s to obtain "?abc? ", or place stamp at index 2 of s to obtain "??abc ". Note that stamp must be fully contained in the boundaries of s in order to stamp (i.e., you cannot place stamp at index 3 of s). We want to convert s to target using at most 10 target.length turns.