03. Stream Of Letters

using System;

namespace StreamOfLetters
{
    class Program
    {
        static void Main(string[] args)
        {
            string word = "";
            string total = "";
            int c = 0;
            int o = 0;
            int n = 0;
            while (true)
            {
                string letter = Console.ReadLine();
                if (letter == "End")
                {
                    break;
                }
                char letters = char.Parse(letter);
                if (letters >= 'A' && letters <= 'Z' || letters >= 'a' && letters <= 'z')
                {
                    if (letters == 'c' && c == 0)
                    {
                        c += 1;
                    }
                    else if (letters == 'o' && o == 0)
                    {
                        o += 1;
                    }
                    else if (letters == 'n' && n == 0)
                    {
                        n += 1;
                    }
                    else
                    {
                        word += letters;
                    }
                    if (c == 1 && o == 1 && n == 1)
                    {
                        c -= 1;
                        o -= 1;
                        n -= 1;
                        total += " " + word;
                        word = "";
                    }
                }
            }
            Console.WriteLine(total);
        }
    }
}