6. Traffic Light

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

namespace SoftUniNetCore
{
    class Program
    {
        static void Main(string[] args)
        {

            int n = int.Parse(Console.ReadLine());
            string str = String.Empty;
            Queue<string> queue = new Queue<string>();
            int counter = 0;
            while (( str = Console.ReadLine()) != "end")
            {
                if (str == "green")
                {
                    int limit = Math.Min(n, queue.Count);
                    for (int i = 1; i <= limit; i++)
                    {
                        Console.WriteLine($"{queue.Dequeue()} passed!");
                        counter++;
                    }
                }
                else
                {
                    queue.Enqueue(str);
                }
            }
            Console.WriteLine($"{counter} cars passed the crossroads.");

        }
    }
}