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

SOLUTION: IZSn

PROBLEM: YWNPkA, LuNPnN

SOLUTION: NP

PROBLEM: dvVeTOU, UDVeTmr

SOLUTION:
VeT