Problem:
Swapping Two Numbers

Write a program which reads two integers x and y, and prints them in ascending order.

Input

The input consists of multiple datasets. Each dataset consists of two integers x and y separated by a single space.

The input ends with two 0 (when both x and y are zero). Your program should not process for these terminal symbols.

Output

For each dataset, print x and y in ascending order in a line. Put a single space between x and y.

Constraints

0 ≤ x, y ≤ 10000

the number of datasets ≤ 3000

Sample Input

3 2
2 2
5 3
0 0

Sample Output

2 3
2 2
3 5

Solution in JAVA (judge verdict: Accepted)

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

static boolean readStrToInt(BufferedReader br)throws IOException{
String str=br.readLine();
String[] arr=str.split(" ");
int x=Integer.parseInt(arr[0]);
int y=Integer.parseInt(arr[1]);
if(x==0 &&y==0) return false;
swapNum(x, y);
return true;
}

static void swapNum(int x, int y){
if(x<=y) System.out.println(x+" "+y);
else System.out.println(y+" "+x);
return;
}
}