instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
NUuLSmDjCKcJPc, lGGSLIDjCKcJBo
answer:
DjCKcJ


question:
oUEcuLINTDdvdOne, thzWccuLINTDQfNZwH
answer:
cuLINTD


question:
PvAzMLSWIbkilkmEoLKiO, XdrMzkVAzMLSWIbkiSRPUzaG
answer:

AzMLSWIbki