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

Q: ssKUiWgGqsXYlFOOc, JDcVTmCgGqsXYlxYE

A: gGqsXYl
****
Q: PGjDRPDzGaBR, rpIJRPDzWi

A: RPDz
****
Q: QWHlEBhDlEYNOKqTAoj, wMlBhDlEYNOKXVi

A:
BhDlEYNOK
****