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

Input: Consider Input: xfZYYDKEqoRRu, ztCeYYDKEqoPG

Output: YYDKEqo


Input: Consider Input: jdLbZSCzaAHGbNwILGmudOH, RdIPuEYJvUZSCzaAHGbNduLToRC

Output: ZSCzaAHGbN


Input: Consider Input: luEBrZWwvnPMlBR, UwICMBrZWwvnPMmh


Output: BrZWwvnPM