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 Python (judge verdict: Accepted)

x=[0]*100000
y=[0]*100000
ct=-1
while True:
    ct+=1
    x[ct],y[ct]=map(int,raw_input().split())
    if x[ct]==y[ct]==0:
        break
    else:
        continue
for i in xrange(ct):
    if x[i]>=y[i]:
        print y[i],x[i]
    else:
        print x[i],y[i]