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

SOLUTION: SEm

PROBLEM: aIZIsqL, wxSZIsEnO

SOLUTION: ZIs

PROBLEM: zBrfEZux, BQimrfEZQFX

SOLUTION:
rfEZ

