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)

class SwapNumber
	def swap(input)
		result = Array.new
		input.each do |val|
			result << val.sort
		end
		result.each do |val|
			puts "#{val[0]} #{val[1]}"
		end
	end
end

array = Array.new

while line = gets
	array << line.split.map(&:to_i)
	break if (array[-1][0] == 0 && array[-1][1] == 0)
end

array.delete_at(-1) ## [0,0]要素を消す

SwapNumber.new.swap(array)