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]: wYhGWdRC, cFGWdHEy
[A]: GWd


[Q]: OkUYhTKoGwSaPGVc, TUhTKoGwSuetDB
[A]:
hTKoGwS