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)

def toi(a)
	b = []
	a.each do |n|
		b << n.to_i
	end
	b	
end
a=toi(gets().split).sort
i = 1
while a[0] !=0 && a[1] != 0
	print("#{a[0]} #{a[1]}\n")
a=toi(gets().split).sort
end