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: zzquzuzquuu

A: uzu
****
Q: xejjjejejx

A: ejjje
****
Q: kiiifkififkiki

A:
iii
****