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

public class Main {

    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String line = br.readLine();
            String[] strArray = new String[2];
            
            while(line.equals("0 0") == false){
            	strArray = line.split("\\s");
            	if(Integer.parseInt(strArray[0]) > Integer.parseInt(strArray[1])){
            		System.out.println(strArray[1] + " " + strArray[0]);
            	}else{
            		System.out.println(strArray[0] + " " + strArray[1]);
            	}
            	
                line = br.readLine();
            }
            br.close();
        } catch (IOException e) {
            System.err.println(e);
        }
    }
}
/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