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

Input: Consider Input: mJoHBJehHtkFS, ZMrDxHBJehHtxS

Output: HBJehHt


Input: Consider Input: BTvLVMYp, mjOvLVMqYo

Output: vLVM


Input: Consider Input: ASgils, NLgivt


Output: gi