2.zhA.Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;


public class Turastat {
    public static void main(String[] args) throws IOException {
        String sor;
        List<Turazo> lista = new ArrayList<Turazo>();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        while((sor = br.readLine()) != null && !sor.equals("blablabla")){
            int bennevan = 0;
            if(sor.contains(":")){
                continue;
            }
            else{
                for(Turazo item : lista){
                    if(item.nev.equals(sor)){
                        bennevan = 1;
                        item.tura++;
                        break;
                    }
                }
            }
            if(bennevan == 0){
                lista.add(new Turazo(sor));
            }
        }

        Collections.sort(lista, (Turazo a, Turazo b) -> {
            return a.nev.compareTo(b.nev);
        });

        for (Turazo turazo : lista) {
            if(turazo.tura == 1)
                System.out.println(turazo.nev);
        }

    }
}

class Turazo{
    public String nev;
    public int tura = 1;
    public Turazo(String nev){
        this.nev = nev;
    }
}