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

SOLUTION: QQnzOF

PROBLEM: SyweIt, ILweip

SOLUTION: we

PROBLEM: DJcszlxYHFwqridldphb, jlQYHFwqriFnLwhp

SOLUTION:
YHFwqri