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

[Q]: zbSNNVc, agSNNtOQ
[A]: SNN


[Q]: uRLpAWCotLmxcSmKyvo, laotLmxcSmKyBwVfJB
[A]: otLmxcSmKy


[Q]: SWNdzbvUKvdfP, pQhbvUKvdxudSPT
[A]:
bvUKvd