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

Q: XbjDHRCWxdPbhibUKn, SrpuPDHRCWxdPbKPWEXNWbZ

A: DHRCWxdPb
****
Q: yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC

A: PZYoKUoQn
****
Q: MnJBRT, tWJBIo

A:
JB
****