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: Wrong Answer)

# -*- coding: utf-8 -*-

import sys

for line in sys.stdin:
    if line[0] == "0" and line[1] == "0":
        break
    if line[0] <= line[1]:
        print "%s %s" %(line[0], line[1])
    else:
        print "%s %s" %(line[1], line[0])