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

Input: Consider Input: IJQqdzqdaGEIcdyh, izlVdzqdaGGiPYz

Output: dzqdaG


Input: Consider Input: zBNTHKtofMdHfBgJhOfojzM, VIkVdFapofMdHfBgjPCUo

Output: ofMdHfBg


Input: Consider Input: BniPRPzKDrT, mLeJIRPzKDovG


Output: RPzKD