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

Q: QEEVsnbQIgrxaZmflaZ, dPSbljkdQIgrxaZmgVzMT

A: QIgrxaZm
****
Q: SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX

A: hzGsanfsa
****
Q: DCSdDxYwdhMsXUm, XlnpPTxzLDxYwdhMsXnRmXWkj

A:
DxYwdhMsX
****