import java.util.Scanner;

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

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