import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	}

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	} main {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int tmp; tmp while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        } true {
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        } int x = sc.nextInt(); x sc.nextInt() sc.nextInt sc int y = sc.nextInt(); y sc.nextInt() sc.nextInt sc if ( x == 0 && y == 0 ) break; x == 0 && y == 0 x == 0 x 0 y == 0 y 0 break; if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            } x > y x y {
            	tmp = x;
            	x = y;
            	y = tmp;
            } tmp = x tmp x x = y x y y = tmp y tmp System.out.println(x + " " + y) System.out.println System.out System System.out x + " " + y x + " " + y x " " y String[] args args public class Main {

	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	}

} public class Main {

	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int tmp;
        while(true){
            int x = sc.nextInt();
            int y = sc.nextInt();
            if ( x == 0 && y == 0 ) break;
            if (x > y){
            	tmp = x;
            	x = y;
            	y = tmp;
            }
            System.out.println(x + " " + y);
        }
	}

}
