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)

while x = gets.split()
  a = x[0].to_i
  b = x[1].to_i
  if a == 0 && b == 0
    break
  end
  if a > b
    puts "#{b}"+" "+"#{a}"
  elsif a == b
    puts "#{a}"+" "+"#{b}"
  else
    puts "#{a}"+" "+"#{b}"
  end
end