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

Q: tmBlKUto, eFDBlKLy

A: BlK
****
Q: OjQHcFUCflYUptUPqYKVomn, GXHcFUCflYUpSSTrQ

A: HcFUCflYUp
****
Q: ygNdHVyahP, FsdrRNdHVyaasp

A:
NdHVya
****