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.

[EX Q]: aaarrrprrapaar
[EX A]: rrprr

[EX Q]: sssususuus
[EX A]: susus

[EX Q]: wawwwzwzwaw
[EX A]:
wzwzw