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

Input: Consider Input: rszjOPpbXm, pnBujOPpWHz

Output: jOPp


Input: Consider Input: cUCQXEFSgRZjK, RYdvUQXEFSgRZVlwx

Output: QXEFSgRZ


Input: Consider Input: LBUilLhqHO, SRilLhsof


Output: ilLh