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: xwawwwxwwawaww

A: wwawaww
****
Q: ncaaanaancacac

A: aanaa
****
Q: nnnnznppznppn

A:
nnnn
****
