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: hhwwhwiwwhi

A: hwwh
****
Q: ntgtnngtggttt

A: ntgtn
****
Q: sstszzzsttttzs

A:
tszzzst
****