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

SOLUTION: afhOWBbY

PROBLEM: XqyPjqNZDEK, EfwPjqNgjIP

SOLUTION: PjqN

PROBLEM: lkVJyhggoIPLSInnuaKeW, TcncnftGqoIPLSInnuGaXHix

SOLUTION:
oIPLSInnu