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

Input: Consider Input: BmwpAnWJ, klVwpAFw

Output: wpA


Input: Consider Input: gWMyioGBRpwcXfr, AOQGBRpwcSccqBE

Output: GBRpwc


Input: Consider Input: eswFeLyNEmVSTFoBDSOENIumw, VxSONEmVSTFoBNZjAWxx


Output: NEmVSTFoB