instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
QEEVsnbQIgrxaZmflaZ, dPSbljkdQIgrxaZmgVzMT
answer:
QIgrxaZm


question:
oWwqraAz, uxTqraonu
answer:
qra


question:
uEoiUWaANMhfSc, ImKHNTiUWaANqhCt
answer:

iUWaAN