import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

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

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

	} main {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int x x y; y for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        } int count = 1; int count = 1; count 1 count++ count++ count {
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        } {
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        } x = scan.nextInt() x scan.nextInt() scan.nextInt scan y = scan.nextInt() y scan.nextInt() scan.nextInt scan if(x == 0 && y == 0)
    	    	break; x == 0 && y == 0 x == 0 x 0 y == 0 y 0 break; if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     } x < y x y {

    	    	 System.out.println(x + " " + y);

    	     } System.out.println(x + " " + y) System.out.println System.out System System.out x + " " + y x + " " + y x " " y {
    	    	 System.out.println(y + " " + x);

    	     } System.out.println(y + " " + x) System.out.println System.out System System.out y + " " + x y + " " + x y " " x String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

	}
} public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        int x,y;
        for(int count = 1; ;count++){
        	x = scan.nextInt();
    	    y = scan.nextInt();
    	    if(x == 0 && y == 0)
    	    	break;


    	    if(x < y){

    	    	 System.out.println(x + " " + y);

    	     }else{
    	    	 System.out.println(y + " " + x);

    	     }
        }

	}
}