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

[Q]: QjDQjzAIsnYgNmmetl, vyqDQjzAIsnNajYEheP
[A]: DQjzAIsn


[Q]: UCbReSfuLcbzmBCl, snQRReSfuLcbzmjqVPSdpp
[A]: ReSfuLcbzm


[Q]: PeUjtZpl, tCWUjtnL
[A]:
Ujt