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

[Q]: nWTnWqkLqYTBxT, cSTnWqkLqYwXmxRF
[A]: TnWqkLqY


[Q]: DZfOjrQffR, CXOjrQQc
[A]: OjrQ


[Q]: MXCdqVAqwUpMLZeGn, VlcAqwUpMGWfDG
[A]:
AqwUpM


