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)

n = []
while (True):
	x = input().split()
	if int(x[0]) == 0 and int(x[1]) == 0:
		break
	n.append(x)
for i in n:
	if i[0] > i[1]:
		print(int(i[1]), int(i[0]))
	else:
		print(int(i[0]), int(i[1]))