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

Input: Consider Input: mjCEUoPmeKbvCgUtUL, SrHtrPmeKbvYpQAVp

Output: PmeKbv


Input: Consider Input: dsngGP, KvnglB

Output: ng


Input: Consider Input: mcrZVtHWTXlhoMnnA, HXZerZVtHWTXApZCsx


Output: rZVtHWTX