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

[Q]: DQVkAbWTTPhoBx, TeWTTPhonxcIKL
[A]: WTTPho


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


[Q]: HnUMofHgfVrcnvSvAvkHL, WQumIrgfVrcnvSbIFzp
[A]:
gfVrcnvS