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

SOLUTION: BzzXIgYWP

PROBLEM: jkGcUm, dxGcSI

SOLUTION: Gc

PROBLEM: xlkGqSQGaw, IxbwkGqSgnWk

SOLUTION:
kGqS