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)

MODE = "stdio"

line = Array.new

if(defined? MODE)
  line = STDIN.read.split("\n")
else
  tmp = "\
  3 2
  2 2
  5 3
  0 0
  ".split("\n")
  tmp.each{|s|
    line << s.strip
  }
end


list = Array.new

list = line.map{|s| s.split(" ")}
  
list.each do|l|
  l.map!(&:to_i)
  l.sort!
end

list.each do |a,b|
  puts "#{a} #{b}" if !(a==0 && b==0)
end