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

[Q]: JjEQVKijeyEQ, dwSVKijeywCTvb
[A]: VKijey


[Q]: BmwpAnWJ, klVwpAFw
[A]: wpA


[Q]: XlybQnpkLarmGyDi, BPmLQnpkLajoQDhF
[A]:
QnpkLa