import java.io.IOException;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	}

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

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	}

} Main public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	} main {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int x x y; y x = 1 x 1 y = 1 y 1 while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      } x != 0 || y != 0 x != 0 x 0 y != 0 y 0 {
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      } x = sc.nextInt() x sc.nextInt() sc.nextInt sc y = sc.nextInt() y sc.nextInt() sc.nextInt sc if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	} (x!=0 || y != 0) && x >= y (x!=0 || y != 0) x!=0 x 0 y != 0 y 0 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 if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	} (x!=0 || y != 0) && x < y (x!=0 || y != 0) x!=0 x 0 y != 0 y 0 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 String[] args args public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	}

} public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	}

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

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0 || y != 0){
    	x = sc.nextInt();
    	y = sc.nextInt();
    	if((x!=0 || y != 0) && x >= y){
    		System.out.println(y+" "+x);}
    	else if((x!=0 || y != 0) && x < y){
        	System.out.println(x+" "+y);
    	}
      }
	}

}