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 Ruby (judge verdict: Wrong Answer)

loop {
    x = gets.split(' ')
    x[0] = x[0].to_i
    x[1] = x[1].to_i
    if (x[0] == 0 && x[1] == 0)
        break
    end
    x[0], x[1] = x[1], x[0]
    puts("#{x[0]} #{x[1]}")
}