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)

nums1=[]
nums2=[]
while True:
    num=[]
    num=input().split()
    for i in range(0,len(num)):
        num[i]=int(num[i])
    if num[0]==0 and num[1]==0:
        break
    nums1.append(num[0])
    nums2.append(num[1])

for i in range(0,len(nums1)):
    if nums1[i]<nums2[i]:
        print(nums1[i],nums2[i])
    else:
        print(nums2[i],nums1[i])