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

SOLUTION: IxbK

PROBLEM: oHoJrr, YAoJSq

SOLUTION: oJ

PROBLEM: CxqbwAMjOCCAJVL, NUVIAfBwAMjOCCALDhnnbZ

SOLUTION:
wAMjOCCA