import java.util.Random;

public class GeneradorContraseñas {
    public static void main(String[] args){
        Random r = new Random();
        int len = r.nextInt(12-8) + 8;
        for(int i = 0; i < len; i++){
            switch(r.nextInt(3)){
                case 0:     // Dígito
                    System.out.printf("%d", r.nextInt(9) + 1);
                    break;
                case 1:     // Minúscula
                    System.out.printf("%c", r.nextInt(26) + (int)('a'));
                    break;
                case 2:     // Mayúscula
                    System.out.printf("%c", r.nextInt(26) + (int)('A'));
                    break;
                default:
            }
        }
        System.out.println();
    }
}