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:
ggngdnddgnng
answer:
gnng


question:
qqqqqqgqggqqqgg
answer:
ggqqqgg


question:
rrurcuurrccccuu
answer:

cccc