package file;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashSet;

public class File {

    public static void main(String[] args)throws IOException {
        BufferedReader be = new BufferedReader(new FileReader("command.txt"));
        HashSet<String> adat = new HashSet<String>();
        String sor;
        while ((sor=be.readLine())!=null) {
         for (String data : adat) {
            sor=be.readLine();
            adat.add(sor);
        }
        for (String ki : adat) {
            System.out.println(ki);
        }
        }

    }

}