/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner input = new Scanner(System.in);
        String nome[] = new String[3];

        for(int i = 0; i<nome.length; ++i) {

        System.out.print("Digite o nome do " +(i+1) + "º aluno: ");
        nome[i] = input.nextLine();

        }

	    System.out.println(" ");
	
	    Arrays.sort(nome);
	    
	    String[] firstNames = new String[nome.length];
	
	    for (int i=0; i< nome.length; i++){
	
	        firstNames[i] = nome[i].split("\\s")[0];         
	    }
    
    	for(String firstName : firstNames){
    		System.out.println(firstName);
    	}
    
	}
}