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: ggngdnddgnng

A: gnng
****
Q: iwvivviivwvwiw

A: ivvi
****
Q: xppgxgxppp

A:
gxg
****