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: ymyaaaayymmaaa

A: yaaaay
****
Q: xoommoommxmm

A: oommoo
****
Q: hwwwlhlwlwhlh

A:
wlhlw
****