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

[Q]: QKlzsmHyBcC, snPtzsmHdMIv
[A]: zsmH


[Q]: mQvintdwLUpClREgxv, rYnoXBtdwLUpClRwxsqX
[A]: tdwLUpClR


[Q]: syafeszFIzucZwzK, JKhLodZzFIzucZCjLWPMy
[A]:
zFIzucZ