instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
oUEcuLINTDdvdOne, thzWccuLINTDQfNZwH
answer:
cuLINTD


question:
IVnbnqBqdPcXfHotUzCYoaGQy, PAlyypBRRBqdPcXfHotpZs
answer:
BqdPcXfHot


question:
tkGOJn, sHGORP
answer:

GO