import java.util.*;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
       
        for(;true;){
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            if(x==0 && y==0)break;
            
            if(x < y){
                System.out.println(x+" "+y);
            }else{
                System.out.println(y+" "+x);
            }
        }
    }
}
 import java.util.*; util.* java import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
       
        for(;true;){
            int x = sc.nextInt();
            int y = sc.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) throws Exception {
        Scanner sc = new Scanner(System.in);
       
        for(;true;){
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            if(x==0 && y==0)break;
            
            if(x < y){
                System.out.println(x+" "+y);
            }else{
                System.out.println(y+" "+x);
            }
        }
    } main {
        Scanner sc = new Scanner(System.in);
       
        for(;true;){
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            if(x==0 && y==0)break;
            
            if(x < y){
                System.out.println(x+" "+y);
            }else{
                System.out.println(y+" "+x);
            }
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) for(;true;){
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            if(x==0 && y==0)break;
            
            if(x < y){
                System.out.println(x+" "+y);
            }else{
                System.out.println(y+" "+x);
            }
        } ; true {
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            if(x==0 && y==0)break;
            
            if(x < y){
                System.out.println(x+" "+y);
            }else{
                System.out.println(y+" "+x);
            }
        } {
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            if(x==0 && y==0)break;
            
            if(x < y){
                System.out.println(x+" "+y);
            }else{
                System.out.println(y+" "+x);
            }
        } 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){
                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) throws Exception {
        Scanner sc = new Scanner(System.in);
       
        for(;true;){
            int x = sc.nextInt();
            int y = sc.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) throws Exception {
        Scanner sc = new Scanner(System.in);
       
        for(;true;){
            int x = sc.nextInt();
            int y = sc.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.*;
import java.util.Scanner;

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

