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

Q: SIIPePlrkftKkzfgdjg, JqNnXHrkftKkzOMUwmc

A: rkftKkz
****
Q: UIjAMFDuxDDGkfQa, VdsHuxDDGkfZHZZ

A: uxDDGkf
****
Q: buTlsPKXCdGObgUdfK, iFauzLGGCdGObgUdQpSZ

A:
CdGObgUd
****