In this task you will be given a string and you should find the longest substring that is a palindrome. A palindrome is a string that is the same backwards as it is forwards. If the shortest possible palindrome is length 1 you should return the first character.

[Q]: qyyqyoyqyyqqq
[A]: qyyqyoyqyyq


[Q]: xxmxxmmmmmm
[A]: mmmmmm


[Q]: ahachaahhhahac
[A]:
ahhha