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]: yzqyyyzzqqy
[A]: yyy


[Q]: qiqqiqiqgqqi
[A]: qiqqiq


[Q]: dydllyyldyylll
[A]:
lyyl