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

Ex Input:
zmbmQuyNGOe, mUMEmQuyiuS

Ex Output:
mQuy


Ex Input:
SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX

Ex Output:
hzGsanfsa


Ex Input:
nuIGPiDtjeuyIPleU, HNUfKAwnGPiDtjeuaXM

Ex Output:

GPiDtjeu