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

Input: Consider Input: gwVLygvd, VOQLyglfo

Output: Lyg


Input: Consider Input: nYoRQU, gQoRZQ

Output: oR


Input: Consider Input: hDnqBfzJMLCmnaqkXBPHqYp, gOTqBDAbMLCmnaqkXrzeR


Output: MLCmnaqkX