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)

arr = []
while true
  input = gets.chomp.split(" ")
  x = input[0].to_i
  y = input[1].to_i
  break if x == 0 && y == 0
  if x > y
    arr += ["#{y} #{x}"]
  else
    arr += ["#{x} #{y}"]
  end
end
arr.each{|answer|
  puts answer
}