instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
aiqZheFuLtXAGRCGNBTAX, ssnVdztXAGRCGNBTIqmSJLZcy
answer:
tXAGRCGNBT


question:
UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza
answer:
QzrfsxRfvI


question:
iUgliliwuGCS, emliliwnzU
answer:

liliw