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: iiddididijjiijd

A: didid
****
Q: zzzmzmrmrmr

A: mrmrm
****
Q: zuzuuuuzuiziui

A:
uzuuuuzu
****