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:
ryzzyzzyyzz
answer:
yzzyzzy


question:
hfhttffhhf
answer:
fhhf


question:
bnlnlbllllbnb
answer:

bllllb