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

Input: Consider Input: ChKUlYUTQQBjZMZkgEed, lmQQBjZMZkgdEf

Output: QQBjZMZkg


Input: Consider Input: VpJvIZdkzKovjc, BZEizZdkzKYZ

Output: ZdkzK


Input: Consider Input: tvDNVInNIbatbsSTT, uoVInNIbadt


Output: VInNIba