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

SOLUTION: SMRv

PROBLEM: XmiLktrUjJDOCJ, UIKrUjJDOQsR

SOLUTION: rUjJDO

PROBLEM: nMSwTbYpYN, TGGSwTbSQ

SOLUTION:
SwTb