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