TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: koIZvrJmfKCO, TBvrtjcWIZvrJmfKRZDOE

SOLUTION: IZvrJmfK

PROBLEM: RyaNyUvXAaZHLXUtYuz, CkbsWxZyUvXAaZHLXJJzugDy

SOLUTION: yUvXAaZHLX

PROBLEM: cJqpVpWvyF, vgepVpWMFFX

SOLUTION:
pVpW