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

Q: wkVVZREWhcSCpvCTB, ZQWhcSCpvCDVUY

A: WhcSCpvC
****
Q: HaLZdTX, tLLZdEXN

A: LZd
****
Q: ocOzcbDSErRjcrufwkMUWXhUNIbG, cDaBhKhYWrRjcrufwkMVWRyrkG

A:
rRjcrufwkM
****