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

Input: Consider Input: TvNVpHLPYjBCeUpyxlzFZ, tgKdPKVYjBCeUpyPK

Output: YjBCeUpy


Input: Consider Input: SODsrWUjUBSgA, WIWUjUBCUUs

Output: WUjUB


Input: Consider Input: fFHLWLGLbDQ, MakKLWLGQYyy


Output: LWLG