instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
eedZoMwKgDhdsgs, kMMwKgDLm
answer:
MwKgD


question:
mQvintdwLUpClREgxv, rYnoXBtdwLUpClRwxsqX
answer:
tdwLUpClR


question:
SrWKtEoVtuAsUsRD, vSJqGEoVtuAsUZWTq
answer:

EoVtuAsU