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

[Q]: ezVsFayUPcrte, lfsFayUMPTqx
[A]: sFayU


[Q]: QaxEaxdouNyyvNAn, wRjWSaxdouNyyrriQiG
[A]: axdouNyy


[Q]: HdDQxguXRZhQpNtPoWgan, NddzlYExguXRZhQpYqRhMwGb
[A]:
xguXRZhQp