import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Attila
 */
public class TuraStat {
    public static void main(String[] args) throws FileNotFoundException, IOException {
//        BufferedReader Console = new BufferedReader(new FileReader("sample.txt"));
        BufferedReader Console = new BufferedReader(new InputStreamReader(System.in));
        String line;
        ArrayList<String> TuraList = new ArrayList<String>();

        while((line = Console.readLine()) != null){
            if(!line.contains(":")){
                if(TuraList.contains(line)){
                    while(TuraList.contains(line)){
                        TuraList.remove(TuraList.indexOf(line));
                    }
                }else TuraList.add(line);
            }
        }
        TuraList.sort((o1, o2) -> {
            return o1.compareTo(o2);
        });
        for (String string : TuraList) {
            System.out.println(string);
        }
    }
}