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

Input: Consider Input: kUoqCMPFTqGE, guoqCMPkwJs

Output: oqCMP


Input: Consider Input: tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW

Output: JoKSOAuV


Input: Consider Input: yOvTVfcfxrRtdkalyubWvABxvcdU, ZFlzTpxrRtdkalyuklkp


Output: xrRtdkalyu