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

Q: spUbdWDLWCeqr, vIuHkWDLWCQEPaz

A: WDLWC
****
Q: iMwanJBuMdiZDL, kIafHeBuMdiZmKNA

A: BuMdiZ
****
Q: MpwSpnhXQqIBcVdciH, dNhXQqIBUEob

A:
hXQqIB
****