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

[Q]: xzMUdHcoYJFWLOILjrg, vCscoYJFWLzO
[A]: coYJFWL


[Q]: XmiLktrUjJDOCJ, UIKrUjJDOQsR
[A]: rUjJDO


[Q]: zlcUXGzPJcJveFhaFZ, igXYcUXGzPJcJMqM
[A]:
cUXGzPJcJ