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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace FizzBuzz_State_Machine
{
    class Program
    {
        static void Main(string[] args)
        {
            Node node = new Increment(0);
            while (node != null) node = node.NextNode();
            Console.ReadLine();
        }
    }

    abstract class Node
    {
        public int CurrentIteration { get; protected set; }
        public Node(int i) { CurrentIteration = i; }
        public abstract Node NextNode();
    }

    class Increment : Node
    {
        public Increment(int i) : base(i) { }
        public override Node NextNode()
        {
            if (CurrentIteration > 0) Console.WriteLine(); 
            CurrentIteration += 1;
            if (CurrentIteration > 100) return null;
            else if (CurrentIteration % 3 == 0) return new Fi(CurrentIteration);
            else if (CurrentIteration % 5 == 0) return new Bu(CurrentIteration);
            else return new N(CurrentIteration);
        }
    }

    class Fi : Node
    {
        public Fi(int i) : base(i) { }
        public override Node NextNode()
        {
            Console.Write("Fi");
            return new Zz(CurrentIteration, true);
        }
    }

    class Bu : Node
    {
        public Bu(int i) : base(i) { }
        public override Node NextNode()
        {
            Console.Write("Bu");
            return new Zz(CurrentIteration, false);
        }
    }

    class Zz : Node
    {
        bool _canLoop;
        public Zz(int i, bool canLoop) : base(i)
        {
            _canLoop = canLoop;
        }
        public override Node NextNode()
        {
            Console.Write("zz");
            if (CurrentIteration % 15 == 0 && _canLoop) return new Bu(CurrentIteration);
            else return new Increment(CurrentIteration);
        }
    }

    class N : Node
    {
        public N(int i) : base(i) { }
        public override Node NextNode()
        {
            Console.Write(CurrentIteration.ToString());
            return new Increment(CurrentIteration);
        }
    }
}

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Fizz
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Buzz
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Fizz
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FizzBuzz
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Buzz
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FizzBuzz
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Fizz
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Buzz
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