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

Ex Input:
DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD

Ex Output:
MXSoyvXQwq


Ex Input:
VeLJEBYpZwxVQlo, EZEBYpZwxVQIxjFj

Ex Output:
EBYpZwxVQ


Ex Input:
YmxOGFjTaE, gDXOGFjzG

Ex Output:

OGFj