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


class Magatro
{
    static void Main()
    {
        string ans = "";
        string S = Console.ReadLine();
        int max = 0;
        int cnt = 0;
        string d = "";
        string be = "";
        for(int i = 0; i < S.Length; i++)
        {
            if (S[i] == 'ｗ')
            {
                if (cnt == 0)
                {
                    be = d;
                }
                cnt++;
                d = "";
            }
            else
            {
                if (d == "")
                {
                    if (cnt > max&&be!="")
                    {
                        max = cnt;
                        ans = be;
                    }
                    else if(cnt==max)
                    {
                        ans +="\n"+ be;
                    }
                }
                d += S[i];
                cnt = 0;
            }
        }
        if (cnt > max && be != "")
        {
            max = cnt;
            ans = be;
        }
        else if (cnt == max)
        {
            ans += " " + be;
        }
        Console.WriteLine(ans);
    }
}