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

SOLUTION: XIE

PROBLEM: ftvxfhsnJEygzV, JYxSfhsnJnIqkW

SOLUTION: fhsnJ

PROBLEM: oMFzbVoYhAC, touCEFzbVoDHvrr

SOLUTION:
FzbVo