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, y = gets.chomp.split(' ').map(&:to_i)
while x != 0 && y != 0
    if x < y
        x=x.to_s
        y=y.to_s
        puts (x+' '+y)
    else
        x = x.to_s
        y = y.to_s
        puts(y+' '+x)
    end
    x, y = gets.chomp.split(' ').map(&:to_i)
end