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)

x = Array.new
y = Array.new
z = Array.new
while 1 do
	z = gets.chomp
	x = z.split(/\s+/)[0].to_i
	y = z.split(/\s+/)[1].to_i
	if x === 0 && y === 0
		break
	end
	print x," ",y,"\n"
end