
import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(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.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(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){
        Scanner sc = new Scanner(System.in);
        while(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);
        while(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) while(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(); 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 System.out System System.out x+" "+y x+" "+y x " " y 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 sc = new Scanner(System.in);
        while(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){
        Scanner sc = new Scanner(System.in);
        while(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.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(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);
        }
    }
}
