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

Input: Consider Input: aZcGMvzBhazkCIFqpVe, AOljBvzBhazkWXeTuA

Output: vzBhazk


Input: Consider Input: yOGvgtAmwMwcIRtJ, cQtAmwMwcIRjfjO

Output: tAmwMwcIR


Input: Consider Input: BeuOTiDvdGMOFr, aRAgrOTiDvdGxMsO


Output: OTiDvdG