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)

a = 1
b = 1
i = 0
n_big = Array.new
n_sma = Array.new

until a==0 && b==0 do
  n = gets
  num = n.split(" ")
  a = num[0].to_i
  b = num[1].to_i  
    
  if a > b then
    n_big << a
    n_sma << b
    else  
    n_big << b
    n_sma << a
  end 
  
  i += 1  

end

for i in 0..i-2 do
  print n_sma[i]," ",n_big[i],"\n"
end