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

SOLUTION: tAmwMwcIR

PROBLEM: QjDQjzAIsnYgNmmetl, vyqDQjzAIsnNajYEheP

SOLUTION: DQjzAIsn

PROBLEM: YWNPkA, LuNPnN

SOLUTION:
NP