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

SOLUTION: BRA

PROBLEM: sJRFPufsaWXNeu, AePufsafc

SOLUTION: Pufsa

PROBLEM: dWQBMqLeCksksbRHWVtbgWE, ddLeCksksbRZZYf

SOLUTION:
LeCksksbR