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

Input: Consider Input: GBTHKtWUzK, ovVNKtWUmVJF

Output: KtWU


Input: Consider Input: JzbEpAquDJFKcNvEWZxVqRV, PFiJlpAquDJFKcNcqOpMeAv

Output: pAquDJFKcN


Input: Consider Input: hQFeKjOhuZONCSbsoVwQjj, FvlzBHuaGZONCSbsoVwFPVQF


Output: ZONCSbsoVw