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

SOLUTION: wx

PROBLEM: UQDJDbzqDxsMzUL, BxClJDbzqDxLxlngc

SOLUTION: JDbzqDx

PROBLEM: sEGwFdFQLHRRT, qfmdGwFdFQLrceChv

SOLUTION:
GwFdFQL