import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        }
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        }
    }
} Main public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        }
    } main {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        }
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        } true {
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        } String strArr[] = br.readLine().split(" "); strArr br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " int a=Integer.parseInt(strArr[0]); a Integer.parseInt(strArr[0]) Integer.parseInt Integer strArr[0] strArr 0 int b=Integer.parseInt(strArr[1]); b Integer.parseInt(strArr[1]) Integer.parseInt Integer strArr[1] strArr 1 if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            } a==0 && b== 0 a==0 a 0 b== 0 b 0 {
            	break;
            } break; if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            } b<a b a {
            	int c=a;
            	a=b;
            	b=c;
            } int c=a; c a a=b a b b=c b c System.out.println(a+" "+b) System.out.println System.out System System.out a+" "+b a+" "+b a " " b String[] args args
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
    public static void main(String[] args) throws IOException {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(a==0 && b== 0){
            	break;
            }
            else if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            }
            System.out.println(a+" "+b);

        }
    }
}