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

Input: Consider Input: zeuyZKwvIOfx, BlmZKwvspUt

Output: ZKwv


Input: Consider Input: zzEhnt, sYEhtc

Output: Eh


Input: Consider Input: MVrdpJTdWcbWvpOVF, coQedWcbWvpQKw


Output: dWcbWvp