import java.util.Scanner;
import java.io.IOException;
public class Main {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    }
} import java.util.Scanner; Scanner java.util import java.io.IOException; IOException java.io public class Main {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    }
} Main public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    } main {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        } sc.hasNext() sc.hasNext sc {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        } int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc if (a == 0 && b == 0)
                break; a == 0 && b == 0 a == 0 a 0 b == 0 b 0 break; if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            } a>=b a b {
                System.out.println(b + " " + a);
            } System.out.println(b + " " + a) System.out.println System.out System System.out b + " " + a b + " " + a b " " a {
                System.out.println(a + " " + b);
            } System.out.println(a + " " + b) System.out.println System.out System System.out a + " " + b a + " " + b a " " b String[] args args public class Main {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    }
} public class Main {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    }
} Main
import java.util.Scanner;
import java.io.IOException;
public class Main {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0)
                break;
            if (a>=b){
                System.out.println(b + " " + a);
            }else{
                System.out.println(a + " " + b);
            }
        }
    }
}