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

Ex Input:
OhMVLbQhBxEaOZY, iDVLbQhBxBiiD

Ex Output:
VLbQhBx


Ex Input:
nhGinCtvLartcMPhJwGRbpZNrq, iQJlFKayEartcMPhJwDRROB

Ex Output:
artcMPhJw


Ex Input:
evMkdaVmEKxabGCoQRlfOUXKOsn, bGTkexGXTEKxabGCoQRNopfEotxgx

Ex Output:

EKxabGCoQR