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

SOLUTION: vSnEBgGapI

PROBLEM: cvZfWOwa, xOfWOhZs

SOLUTION: fWO

PROBLEM: mfDrBlJ, yJzDrBwa

SOLUTION:
DrB