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]: dbbbddttdb
[A]: dbbbd


[Q]: xnnxxxxnxx
[A]: nxxxxn


[Q]: bsbppbbbpppbbs
[A]:
ppbbbpp