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: Accepted)

nums = []
loop do
    num = gets.split(" ")
    if num[0] == "0" && num[1] == "0"; break; end
    nums << num
end
(0...nums.size).each do |i|
    if nums[i][1].to_i < nums[i][0].to_i
        print nums[i][1], " ", nums[i][0], "\n"
    else
        print nums[i][0], " ", nums[i][1], "\n"
    end
end