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

SOLUTION: WjLK

PROBLEM: ZGkBNEDRAwURXnxBIOJkzTvg, HMAwURXnxBMfGbPOBf

SOLUTION: AwURXnxB

PROBLEM: HVVqfF, JtVqkJ

SOLUTION:
Vq