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

Input: Consider Input: gWMyioGBRpwcXfr, AOQGBRpwcSccqBE

Output: GBRpwc


Input: Consider Input: CiElmOvTqJGVJkfSaDRzE, EjDJwMyxTvTqJGVJkfluB

Output: vTqJGVJkf


Input: Consider Input: OVVkkdeHoFlyNROyCP, zFVUJbvkkdeHoFlysF


Output: kkdeHoFly