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 Go (judge verdict: Accepted)

package main

import "fmt"

func main() {
	for i := 1; ; i++ {
		var x, y int
		fmt.Scan(&x)
		fmt.Scan(&y)
		if x == 0 && y == 0 {
			break
		}
		if x < y {
			fmt.Println(x, y)
		} else {
			fmt.Println(y, x)
		}
	}
}