Problem B
Three Powers
Consider the set of all nonnegative integer powers of 3.

$S = \{ 1, 3, 9, 27, 81, \ldots \} $
Consider the sequence of all subsets of $S$ ordered by the value of the sum of their elements. The question is simple: find the set at the $n$th position in the sequence and print it in increasing order of its elements.
Input
Each line of input contains a number $n$, which is a positive integer with no more than $19$ digits. The last line of input contains $0$ and it should not be processed. There are at most $100$ test cases.
Output
For each line of input, output a single line displaying the $n$th set as described above, in the format used in the sample output.
Sample Input 1  Sample Output 1 

1 7 14 783 1125900981634049 0 
{ } { 3, 9 } { 1, 9, 27 } { 3, 9, 27, 6561, 19683 } { 59049, 3486784401, 205891132094649, 717897987691852588770249 } 