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

[Q]: cfvqbAUpWEmhCSFaUvGrYVNGeUiRP, hAxWMEmhCSFaUvGLBLmdTxhy
[A]: EmhCSFaUvG


[Q]: rszjOPpbXm, pnBujOPpWHz
[A]: jOPp


[Q]: tBrZuozwQpFlJah, VbozwQpoAR
[A]:
ozwQp