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

SOLUTION: wZ

PROBLEM: ScUCglVzZFPjLVofNHOumU, mNodEXwpZFPjLVofYfSnBM

SOLUTION: ZFPjLVof

PROBLEM: ktnfABAzbVxyV, WlmkBAzbVZrJ

SOLUTION:
BAzbV