import java.util.Scanner;

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

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

