instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
osmJJcZlDAXBgJFsJKa, rzPNlDAXBgJYrgXlH
answer:
lDAXBgJ


question:
jexvmCmveGzFUimQMx, RVwOSJveGzFUimrcOwjEwe
answer:
veGzFUim


question:
JZWDSfGrFntq, ZjGZSfGrijU
answer:

SfGr