void Start() { IPencil pencil = new Pencil(20); IPencilSharpener pencilSharpener = new PencilSharpener(); string input; while (true) { Console.Write("Enter a word: "); input = Console.ReadLine(); if (input == "stop") { return; } if (input == "sharpen") { pencilSharpener.Sharpen(pencil); } else { pencil.Write(input); } } }