instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
HSsyZzZLZAAq, MFEZzZLJC
answer:
ZzZL


question:
iYuUgULgqcAgd, kRNUgULgqFv
answer:
UgULgq


question:
KgzodQSzCtlPFjPAbtwpGb, PIRkeLaSzCtlPFjqC
answer:

SzCtlPFj