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

Input: Consider Input: cCDTMXjGMNikONun, jpcMXjGMNizBEWQzT

Output: MXjGMNi


Input: Consider Input: fBpRXPkikQokGVeS, FwUbKXkikQokGos

Output: kikQokG


Input: Consider Input: qIvktJGL, kKktJIZ


Output: ktJ