import java.util.Scanner;

public class Main {

	public static void main (String[] args) {

		Scanner sc = new Scanner(System.in);
		
		for (;;) {
			int a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(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 a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		}
		
		sc.close();
	}

} Main public static void main (String[] args) {

		Scanner sc = new Scanner(System.in);
		
		for (;;) {
			int a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		}
		
		sc.close();
	} main {

		Scanner sc = new Scanner(System.in);
		
		for (;;) {
			int a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		}
		
		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) for (;;) {
			int a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		} ; {
			int a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		} {
			int a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		} 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; System.out.println(a < b ? (a + " " + b) : (b + " " + a)) System.out.println System.out System System.out a < b ? (a + " " + b) : (b + " " + a) a < b a b (a + " " + b) a + " " + b a " " b (b + " " + a) b + " " + a 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 a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(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 a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(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 a = sc.nextInt();
			int b = sc.nextInt();
			if (a == 0 && b == 0) break;
			System.out.println(a < b ? (a + " " + b) : (b + " " + a));
		}
		
		sc.close();
	}

}