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

Input: Consider Input: aWshKwEuYBBdSwIAyXw, wfVuYBBdSwIAseTxR

Output: uYBBdSwIA


Input: Consider Input: bmsrkXGb, GcarkXOZF

Output: rkX


Input: Consider Input: ZUsNrNwMpwomLQdRSdK, xlMGMpwomLQdRSvFyKq


Output: MpwomLQdRS