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]: yybbkyybybkykk
[EX A]: yby

[EX Q]: aamaaahaham
[EX A]: aamaa

[EX Q]: isijsjsjjjsijjj
[EX A]:
jsjsj