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

SOLUTION: kmY

PROBLEM: faHRBWyXsYzYmHQyy, aHTyXsYzYeXBFV

SOLUTION: yXsYzY

PROBLEM: NyCAavaGIqKoPYKRrS, dFIaGIqKoPhTll

SOLUTION:
aGIqKoP