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

SOLUTION: JvL

PROBLEM: HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX

SOLUTION: NCGmJElj

PROBLEM: LNwJXMigwfcdnzeAgI, hQKfjwJXMigwfcNJL

SOLUTION:
wJXMigwfc