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

[Q]: WTnsmP, INnsIM
[A]: ns


[Q]: OyrqfQQnzOFUzrkDM, iBkQQnzOFewhjvO
[A]: QQnzOF


[Q]: BPMVxvSrRjKaLlTinK, MiTvSrRjKaLlTjAHtDHxITl
[A]:
vSrRjKaLlT