
import java.util.*;

class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int i=0;
for(;;){
int n =sc.nextInt();
int m =sc.nextInt();
if(n==0 && m==0) break;
if(n>m){ i=n; n=m; m=i;} 
System.out.println(n+" "+m);
}
}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz