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

[Q]: TTagIJmzrOTdnKr, UONmtdHJmzrOTduWo
[A]: JmzrOTd


[Q]: WjyKtxKtEYjP, vuBZJZyKtxKtXRZs
[A]: yKtxKt


[Q]: SieMhUOBXuM, ILlJMhUOQhp
[A]:
MhUO