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:
jjyyjyyrry
answer:
yyjyy


question:
jbjwjjwwwwwb
answer:
wwwww


question:
rerereeewewew
answer:

rerer