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

Input: Consider Input: UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW

Output: bmsXkKQuzN


Input: Consider Input: jJSSBmflUyrEMLjSycA, YkmujkSSBmflUyrKKJZ

Output: SSBmflUyr


Input: Consider Input: YwkrqPYtvfjFL, iBrqPYtvHryzwa


Output: rqPYtv