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

Ex Input:
JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH

Ex Output:
ILNeNQbJy


Ex Input:
CUlMsvov, iflMsSRp

Ex Output:
lMs


Ex Input:
DGvUCrUVlUnQBShkWnfnceGasvI, NfzGUnQBShkWnpLMnY

Ex Output:

UnQBShkWn