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: QvtDqzQiSknPbRCG, hVxHdqzQiSknPbumdpNIf

Output: qzQiSknPb


Input: Consider Input: FYzPmyQcYDDPjrsPTwlnp, SkZCRQcYDDPjrYjtMREs


Output: QcYDDPjr