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: uydddduuudyuddu

A: duuud
****
Q: zxzzffzzfx

A: zzffzz
****
Q: vllvvhhvvvlvhlv

A:
vvhhvv
****