using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace ExtractURLs
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> list = new List<string>();
            string input = Console.ReadLine();
            string[] inputArray = input.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < inputArray.Length; i++)
            {
                Match match = Regex.Match(inputArray[i], @"(https?|http|file)\://|www.)", RegexOptions.IgnoreCase);
                if (match.Success)
                {
                    string key = match.Groups[1].Value;
                    Console.WriteLine(key);
                }
            }
        }
    }
}