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

[Q]: OezHeoe, ouUzHemU
[A]: zHe


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


[Q]: QfhHtCJIj, UMDYhHtCkc
[A]:
hHtC