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

Q: pYmzRnGPQVPrqPApKTyvaO, tNGPQVPrqPVTh

A: GPQVPrqP
****
Q: rduIwWNGM, AJqYIwWNaCap

A: IwWN
****
Q: CTDaLneIkDuXBDYrK, iazsLneIkDuVdbys

A:
LneIkDu
****