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]: mlrrrrrmmmllrr
[A]: rrrrr


[Q]: qjcjcqqqqjjcqq
[A]: qqqq


[Q]: oooohyooyoyh
[A]:
oooo