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

SOLUTION: GzbnDXWnN

PROBLEM: ykDpbd, YFDpmO

SOLUTION: Dp

PROBLEM: ehVgnklPjzKdxaHTmVvuabAOc, NsvKAjzKdxaHTmVxwUR

SOLUTION:
jzKdxaHTmV