(SPOJ) 8707 - Chamada - Solução

import java.io.*;
import java.util.*;

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.processa();
       
        System.exit(0);
    }
   
    void processa() throws NumberFormatException, IOException {
        String line = "";
       
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        line = br.readLine();
        StringTokenizer tokenizer = new StringTokenizer(line);
        int numAlunos = Integer.valueOf(tokenizer.nextToken());
        int alunoSorteado = Integer.valueOf(tokenizer.nextToken());
       
        String[] alunos = new String[numAlunos];    
        for (int i = 0; i < numAlunos; i++) {
            alunos[i] = br.readLine();
        }   
           
        Arrays.sort(alunos);
       
        System.out.println(alunos[alunoSorteado-1]);
                           
        return;
    }
}