instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ZKMRTxCxbsbX, iovHrMRTxCxbsjv
answer:
MRTxCxbs


question:
wcJmSloqlddFOfv, szhUIAqzSloqlddFDJz
answer:
SloqlddF


question:
WhzrTDMVYZnIamWPeOd, pJsryZVYZnIamWRpy
answer:

VYZnIamW