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

Input: Consider Input: OFbCjZDoRRlLsMU, DcCjZDoRRtld

Output: CjZDoRR


Input: Consider Input: ssKUiWgGqsXYlFOOc, JDcVTmCgGqsXYlxYE

Output: gGqsXYl


Input: Consider Input: gfbvutYoTIbhiZlAnXEbqE, XZqeRHRbvutYoTIbhYsGvrX


Output: bvutYoTIbh