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

Q: iYuUgULgqcAgd, kRNUgULgqFv

A: UgULgq
****
Q: iwSQnplQZFbXQ, lHWnplQZFzswgU

A: nplQZF
****
Q: ipngSIITcyOAgL, WZgSIITcDD

A:
gSIITc
****