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

SOLUTION: bUtmnKaEJ

PROBLEM: gfXPLNzsyfEotmHL, oJeXPLNzsyJuXP

SOLUTION: XPLNzsy

PROBLEM: kkJCsGfLvWqXcfOK, nqRvCsGfLvWqXcbsOwOrR

SOLUTION:
CsGfLvWqXc