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

[Q]: oXZmCSdFrMumlZcP, eFpOZmCSdFrIuHeS
[A]: ZmCSdFr


[Q]: PQCjJwXurLeN, vsjJwXuOy
[A]: jJwXu


[Q]: avkKJPmqeacbodcqlq, WMmqeacbodcgXONNrvXL
[A]:
mqeacbodc