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

Input: Consider Input: oDdulHNcCdgbRGxiBTxM, kDcCdgbRGnsJlvas

Output: cCdgbRG


Input: Consider Input: zBNTHKtofMdHfBgJhOfojzM, VIkVdFapofMdHfBgjPCUo

Output: ofMdHfBg


Input: Consider Input: tVVJKFpGMF, OiQUVJKFpjXhu


Output: VJKFp