import java.util.Scanner;

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

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