/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Random;
 
/* 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
	{
		 /*-----------------------------------*/   
        Random rnd = new Random();
        String num ="";
 
        for (int i = 0; i < 8; i++) {
            if (i < 4) { //Obtiene los primeros 4 numeros.
                num += rnd.nextInt(8);
            } else {
                //Obtiene caracter aleatorio entre 65 y 90 ("A" y "Z").
                num += String.valueOf((char) (rnd.nextInt(90-65) + 65));
            }
        }
        /*-----------------------------------*/
         System.out.println(num);
	}
}

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