import java.util.Scanner;

public class Main {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    }

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

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    }

} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        } int i = 0; int i = 0; i 0 i < 3000 i 3000 ++i ++i i {
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        } {
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        } int a = sc.nextInt() a sc.nextInt() sc.nextInt sc b = sc.nextInt(); b sc.nextInt() sc.nextInt sc if(a == 0 && b == 0) break; a == 0 && b == 0 a == 0 a 0 b == 0 b 0 break; System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a) System.out.printf System.out System System.out "%d %d\n" a < b ? a : b a < b a b a b a < b ? b : a a < b a b b a sc.close() sc.close sc String[] args args public class Main {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    }

} public class Main {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    }

} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int i = 0;i < 3000;++i){
            int a = sc.nextInt(),b = sc.nextInt();
            if(a == 0 && b == 0) break;
            System.out.printf("%d %d\n",a < b ? a : b,a < b ? b : a);
        }
        sc.close();
    }

}