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

SOLUTION: TWbL

PROBLEM: CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU

SOLUTION: DeNZwCPbJ

PROBLEM: eJPZzg, lFPZbI

SOLUTION:
PZ