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

SOLUTION: DsKQ

PROBLEM: ATmVEtUuZOgsBUuL, UMUuZOgsBPVT

SOLUTION: UuZOgsB

PROBLEM: KUhTbWDnvhm, OSbphTbWDqNbL

SOLUTION:
hTbWD