instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza
answer:
QzrfsxRfvI


question:
krnkpodgfpCKtfCqyzUbymWbxi, DydgSWpCKtfCqyzDaMsjqc
answer:
pCKtfCqyz


question:
UKJeWviecJKaoDDQjPUyp, uBEtnbJeWviecJKapL
answer:

JeWviecJKa