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

SOLUTION: exXGlpB

PROBLEM: BUvWkxrAvDQG, rHrkxrAkCE

SOLUTION: kxrA

PROBLEM: yPzJmvIXOMmuwbkQcaFmJZ, DJDzJmvIXOMmuypxmFGi

SOLUTION:
zJmvIXOMmu