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)

x = []
y = []

i = 0

while True:
    indata = input().split()
    x.append(indata[0])
    y.append(indata[1])
    if int(x[i]) == int(y[i]) == 0:
        break
    i += 1

for j in range(len(x)):
    if int(x[j]) != 0 and int(y[j]) != 0:
        if int(x[j]) < int(x[j]):
            print(x[j],y[j])
        else:
            print(y[j],x[j])