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: pyppydddydp

A: ydddy
****
Q: tztzxzxtzxtzzt

A: tzzt
****
Q: xxxxxxxxxtt

A:
xxxxxxxxx
****