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

Input: Consider Input: EyvnjbVLF, vqnjblzR

Output: njb


Input: Consider Input: BUvWkxrAvDQG, rHrkxrAkCE

Output: kxrA


Input: Consider Input: LzYJIlSPzljE, urqIfaOJIlSPzlRr


Output: JIlSPzl