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

Input: Consider Input: lPhVhAQZWJDrvzcEaGEwKgZAuJI, qIJDrvzcEaGDRCRrB

Output: JDrvzcEaG


Input: Consider Input: oKZCAErEMqzODnkcNqxVdoBOC, yHzRJuSqzODnkcNqxExr

Output: qzODnkcNqx


Input: Consider Input: ZRjPgqbLL, uIsmPgqbBB


Output: Pgqb