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

SOLUTION: XbnluNuv

PROBLEM: ftvxfhsnJEygzV, JYxSfhsnJnIqkW

SOLUTION: fhsnJ

PROBLEM: LgJwDs, pEJwNL

SOLUTION:
Jw