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: wvvvwvwhvhhvhvv

A: hvhhvh
****
Q: gojjjojooooog

A: ojjjo
****
Q: affffffxaxaf

A:
ffffff
****