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

SOLUTION: VlCwpfO

PROBLEM: SJIkEibGrqcrOBgGjYjJc, EervOGrqcrOBgGJZyx

SOLUTION: GrqcrOBgG

PROBLEM: zhKaNX, UNKabO

SOLUTION:
Ka