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

Input: Consider Input: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT

Output: joSidWiv


Input: Consider Input: kvutZfcPKzHE, kTKutZfcPTGmU

Output: utZfcP


Input: Consider Input: lERJcy, QmRJyo


Output: RJ