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

[Q]: tmBlKUto, eFDBlKLy
[A]: BlK


[Q]: GlAYDsKQoXy, IxDsKQuK
[A]: DsKQ


[Q]: zCTqoD, YPTqgJ
[A]:
Tq