import java.util.Scanner;

public class Main {
    public static Scanner sc;
    public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static Scanner sc;
    public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    }
} Main public static Scanner sc; sc public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    } main {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    } sc = new Scanner(System.in) sc new Scanner(System.in) while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        } sc.hasNext() sc.hasNext sc {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        } int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int 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; if (a > b) {
                int t = a;
                a = b;
                b = t;
            } a > b a b {
                int t = a;
                a = b;
                b = t;
            } int t = a; t a a = b a b b = t b t System.out.println(a + " " + b) System.out.println System.out System System.out a + " " + b a + " " + b a " " b String[] args args public class Main {
    public static Scanner sc;
    public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    }
} public class Main {
    public static Scanner sc;
    public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static Scanner sc;
    public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int a = sc.nextInt();
            int b = sc.nextInt();
            if (a == 0 && b == 0) break;
            if (a > b) {
                int t = a;
                a = b;
                b = t;
            }
            System.out.println(a + " " + b);
        }
    }
}