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]: ppuupeeppepp
[A]: ppepp


[Q]: jmmmzjzjjzmmm
[A]: zjjz


[Q]: hdhhdhhhhhhdhhh
[A]:
hhdhhhhhhdhh