In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: wDSKHtWbCDqTeoBeiYHdcZD, MydQCwqTeoBeiYHdYMp

A: qTeoBeiYHd
****
Q: fdxgzAMP, xrcxgzYW

A: xgz
****
Q: wjCDgXhaUBvRJkmF, MTPhaUBvRJDhtd

A:
haUBvRJ
****
