
import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int x, y;
		while(true) {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				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);
		int x, y;
		while(true) {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				System.out.println(+x + " " + y);
			}
		}
	}
} Main public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int x, y;
		while(true) {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				System.out.println(+x + " " + y);
			}
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int x, y;
		while(true) {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				System.out.println(+x + " " + y);
			}
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int x x y; y while(true) {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				System.out.println(+x + " " + y);
			}
		} true {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				System.out.println(+x + " " + y);
			}
		} x = sc.nextInt() x sc.nextInt() sc.nextInt sc y = sc.nextInt() y sc.nextInt() sc.nextInt sc if(x > y) {
				System.out.println(+y + " " + x);
			} 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 y " " x if(x == 0 && y == 0) {
				break;

			} x == 0 && y == 0 x == 0 x 0 y == 0 y 0 {
				break;

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

			}

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

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				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);
		int x, y;
		while(true) {
			x = sc.nextInt();
			y = sc.nextInt();
			if(x > y) {
				System.out.println(+y + " " + x);
			}
			if(x == 0 && y == 0) {
				break;

			}

			if(x < y) {
				System.out.println(+x + " " + y);
			}
			if(x == y) {
				System.out.println(+x + " " + y);
			}
		}
	}
}

