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

Input: Consider Input: yQRDycTycwH, ImycTycrR

Output: ycTyc


Input: Consider Input: sbQJFbUtmnKaEJePFPeRM, QzfvkdZbUtmnKaEJNrWD

Output: bUtmnKaEJ


Input: Consider Input: gHFwDorPbNPORVgdLW, AfqDQvCGFwDorPbNPVPVmbQ


Output: FwDorPbNP