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

Q: iwSQnplQZFbXQ, lHWnplQZFzswgU

A: nplQZF
****
Q: XbjDHRCWxdPbhibUKn, SrpuPDHRCWxdPbKPWEXNWbZ

A: DHRCWxdPb
****
Q: OIgRfjnvZoqGYKnkgW, IYvZoqGYKNJwWD

A:
vZoqGYK
****