instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
lLxXqKscqizXTO, TqrKscqizutDudo
answer:
Kscqiz


question:
YKpdeJQhzyYiPoODACUu, mjmnIlCehzyYiPoOzZ
answer:
hzyYiPoO


question:
qViMyutIFzQOuwed, MBzuhXutIFzQOuwZQGaJenQ
answer:

utIFzQOuw