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: Wrong Answer)

'''
ITP-1_3-C
 2 ????????°?????????
???????????´??° x, y ?????????????????????????????????????°?????????????????????????????????°?????????????????????????????????
?????????????????????????????\?????????????????????????????????????????????????????????????????????????????¨?????¨?????????????????????
???Input
??\???????????°????????????????????????????§?????????????????????????????????????????????????????????§??????????????????????????´??° x, y ?????????
?????????????§?????????????????????????
???Output
??????????????????????????¨??????x ??¨ y ????°????????????????????????????????????????????????????????????????x ??¨ y ????????????????????????????????\??????????????????
'''
# import
import sys

# input???????????????
for inputData in sys.stdin:
    inputData = inputData.split(" ")
    inputData01, inputData02 = int(inputData[0]), int(inputData[1])
    # 0?????´??? ????????????
    if inputData01 == 0:
        if inputData02 == 0:
            break

    if inputData01 > inputData02:
        outputData01 = inputData02
        outputData02 = inputData01
    elif inputData01 < inputData02:
        outputData01 = inputData01
        outputData02 = inputData02

    # ????????????
    print((outputData01), (outputData02))