instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
DQVkAbWTTPhoBx, TeWTTPhonxcIKL
answer:
WTTPho


question:
XWKEpwGRkfCFZGOyZQOoypx, lhQkmVqeRkfCFZGOyugPLqs
answer:
RkfCFZGOy


question:
tnveli, VOvejB
answer:

ve