instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
MSzHyOuaJILkeY, eUibEHoHyOuaJIhfvXy
answer:
HyOuaJI


question:
eedZoMwKgDhdsgs, kMMwKgDLm
answer:
MwKgD


question:
bUcuzFgsdfojVR, IdcuzFgsdMRgtMA
answer:

cuzFgsd