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

[Q]: UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc
[A]: JDbzqDx


[Q]: VRXUhOYfTul, JqZUhOYKq
[A]: UhOY


[Q]: kvutZfcPKzHE, kTKutZfcPTGmU
[A]:
utZfcP