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

SOLUTION: chtNymcsw

PROBLEM: qQkmYsYN, UhkmYHSy

SOLUTION: kmY

PROBLEM: pmAJUMyZDTHoB, cUwHUMyZDTPgv

SOLUTION:
UMyZDT