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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string inpt = Reader.ReadLine();
        
        string txt = string.Empty;
        string w = string.Empty;
        
        List<Word> list = new List<Word>();
        for(int i=0; i<inpt.Length; i++) {
            if(inpt[i] == 'ｗ') {
                w+=inpt[i];
            } else
            {
                if(w.Length > 0) {
                    list.Add(new Word(txt, w));
                    w = string.Empty;
                    txt = string.Empty;
                }
                txt += inpt[i];
            }
        }
        if(w.Length > 0) {
            list.Add(new Word(txt, w));
        }
        
        if(list.Count(a=>a.Text.Length > 0) == 0) {
            Console.WriteLine(string.Empty);
            return;
        }
        int max = list.Where(a=>a.Text.Length > 0).Max(a=>a.Waros.Length);
        if(max == 0) {
            Console.WriteLine(string.Empty);
            return;
        }
        list.Where(a=>a.Waros.Length == max).ToList().ForEach(a=>Console.WriteLine(a.Text));
        

    }
    
    public class Word {
        public String Text;
        public String Waros;
        
        public Word(string txt, string w) {
            this.Text = txt;
            this.Waros = w;
        }
    }
    

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"



ｗｗそれなｗｗ




";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}