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

SOLUTION: DXJQDQxQ

PROBLEM: JKZiYILNeNQbJyznES, PHKILNeNQbJylltYH

SOLUTION: ILNeNQbJy

PROBLEM: kchNwzLHgmqto, KBiNNwzLHpz

SOLUTION:
NwzLH