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

SOLUTION: LH

PROBLEM: YcgVJVACcQE, JsJVACcSz

SOLUTION: JVACc

PROBLEM: QWHlEBhDlEYNOKqTAoj, wMlBhDlEYNOKXVi

SOLUTION:
BhDlEYNOK