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

Input: Consider Input: zqRbqwgmqGIAGTeeoGFOSr, RFnLqwgmqGIAGLcEvAWxY

Output: qwgmqGIAG


Input: Consider Input: njzfcapS, JDzfcYQh

Output: zfc


Input: Consider Input: ZbLdJveigEThyP, XFNELdJveizcI


Output: LdJvei