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 Python3 (judge verdict: Accepted)

# coding: utf-8

list = []

while True:
    num = input().rstrip().split(" ")
    if int(num[0]) == 0 and int(num[1]) == 0:
        break
    list.append(num)


for i in range(len(list)):
    if int(list[i][0]) <= int(list[i][1]):
        print(str(list[i][0]) + " " + str(list[i][1]))
    else:
        print(str(list[i][1]) + " " + str(list[i][0]))