instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
JAfPtjqqUYMD, cpXItjqqFN
answer:
tjqq


question:
OFbCjZDoRRlLsMU, DcCjZDoRRtld
answer:
CjZDoRR


question:
eGgpWIeVwWVRxVobwrl, InkVpWIeVwWVRxdqH
answer:

pWIeVwWVRx