import java.util.Scanner;

public class Main{
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      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);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    }
  }
} Main public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    }
  } main {
    Scanner scan = new Scanner(System.in);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    }
  } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    } int i=0; int i=0; i 0 i<3000 i 3000 i++ i++ i {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    } {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      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;
      } break; int z; z if(x > y) {
        z = x; x = y; y = z;
      } x > y x y {
        z = x; x = y; y = z;
      } z = x z x x = y x y y = z y z 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 scan = new Scanner(System.in);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    }
  }
} public class Main{
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      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);
    for(int i=0; i<3000; i++) {
      int x = scan.nextInt(); int y = scan.nextInt();
      if(x==0 && y==0) {
        break;
      }
      int z;
      if(x > y) {
        z = x; x = y; y = z;
      }
      System.out.println(x + " " + y);
    }
  }
}