import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		for(int i = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	}
} 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 = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		for(int i = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	} main {
		Scanner sc = new Scanner(System.in);
		for(int i = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) for(int i = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		} int i = 1 ; int i = 1 ; i 1 i <= 10000 i 10000 i++ i++ i {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		} {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			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 int t = 0; t 0 if(x > y) {
				t = x;
				x = y;
				y = t;
			} x > y x y {
				t = x;
				x = y;
				y = t;
			} t = x t x x = y x y y = t y t if(x == 0 && y == 0) {
				break;
			} x == 0 && y == 0 x == 0 x 0 y == 0 y 0 {
				break;
			} break; 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 = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		for(int i = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		for(int i = 1 ; i <= 10000; i++) {
			int x = sc.nextInt();
			int y = sc.nextInt();
			int t = 0;
			if(x > y) {
				t = x;
				x = y;
				y = t;
			}
			if(x == 0 && y == 0) {
				break;
			}
			System.out.println(x + " " + y);
		}
	}
}