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: oqxqqqxqxoo

A: qxqqqxq
****
Q: vwwvwwvwvwh

A: vwwvwwv
****
Q: mlylmyyllmm

A:
mlylm
****