public class Main {


		public static void main(String[] args) {
		java.util.Scanner scan = new java.util.Scanner(System.in);
		int x;
		int y;
		int i;
		int t = 0;
		
		do{
		x = scan.nextInt();
		y = scan.nextInt();
		if(0<=x && x<=10000 && 0<=y && y<=10000){
			if(x == 0 && y == 0){
				break;
			}
			if(x<=y){
			System.out.println(x+" "+y);
			}else if(x>y){
				i = x;
				x = y;
				y = i;
				System.out.println(x+" "+y);
			}
		}
		t += 1;
		

	}while(t < 3000);
}
}
/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