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: rlBoVyFsYqpmmQmelGBg, iKKaIyFsYqpmmWcrKn

Output: yFsYqpmm


Input: Consider Input: xOqVCqWTHZCXulhl, DgqVCqWTHZCZMmqiziag


Output: qVCqWTHZC