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)

arr = Array.new
while str = STDIN.gets
    op1,op2=str.chomp.split.map{|v|v.to_i}
    break if op1==0 && op2==0
    arr.insert(arr.length,[op1,op2])
end

arr.each do |elm|
    if elm[0]>elm[1] then print elm[1]," ",elm[0],"\n"
    else print elm[0]," ",elm[1],"\n"
    end
end