instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
jXqEDHTCxTiUAICWZJdpmYq, GBTCxTiUAICZKnLgZBXi
answer:
TCxTiUAIC


question:
faHRBWyXsYzYmHQyy, aHTyXsYzYeXBFV
answer:
yXsYzY


question:
hOdZFQ, ZtdZSY
answer:

dZ