instruction:
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.
question:
tttttfttfttff
answer:
ttfttftt


question:
nsnnsggngsgg
answer:
snns


question:
fpxpppfppxffp
answer:

ppfpp