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

Q: RinootTGLjbRGYznmBdH, oRMtTGLjbRGYzwEVHsjW

A: tTGLjbRGYz
****
Q: uZSRkFDHsGXNMaggxUn, lTrQKKpsGXNMaggEdSrEX

A: sGXNMagg
****
Q: QwOTtHjAEiU, lyWTtHjAfE

A:
TtHjA
****