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:
ohhohnnnhhhh
answer:
hnnnh


question:
ehaaaehhehhheaa
answer:
hhehh


question:
iioionnniinnn
answer:

nnniinnn