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)

i = 0
a = Array.new
a[i], a[i+1] = gets.split.map(&:to_i)
while a[i] != 0 || a[i+1] != 0
	i += 2
a[i], a[i+1] = gets.split.map(&:to_i)
end
i = 0
while a[i] != 0 || a[i+1] != 0
	if a[i] < a[i+1] then
		puts "#{a[i]} #{a[i+1]}"
	else
		puts "#{a[i+1]} #{a[i]}"
	end
	i += 2
end