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

Q: KJswoapnXz, EQswoaFyH

A: swoa
****
Q: tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW

A: JoKSOAuV
****
Q: tnjXqgomcBQzXbhQVwQRHro, JsnzgomcBQzXbhFWQbQ

A:
gomcBQzXbh
****