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