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)

while true
  tmp = gets.split(' ')
  input = tmp.map(&:to_i)
  if input[0] == 0 && input[1] == 0
    break
  elsif input[0] < input[1]
    print("%d %d\n" % [input[0], input[1]])
  elsif input[0] > input[1]
    print("%d %d\n" % [input[1], input[0]])
  end
end