Dear Statalisters,

I need to drop the leading zeros of lots of separate variables. I have data like this:

days a b c d e
1 3 0 0 0 0
2 1 0 0 0 0
3 0 0 0 0 0
4 0 0 0 0 0
5 1 0 0 0 0
6 1 0 0 0 1
7 0 0 0 0 0
8 3 0 0 1 1
9 2 0 1 0 0
10 1 0 0 0 0
11 6 0 2 1 0
12 6 2 0 1 0
13 9 0 2 0 1
14 4 0 0 0 0
15 5 0 0 0 1
16 5 0 0 0 0
17 4 0 0 0 0
18 0 0 0 0 0

And I would like to have data like this:
days a b c d e
1 3 2 1 1 1
2 1 0 0 0 0
3 0 0 2 0 1
4 0 0 0 1 0
5 1 0 2 1 0
6 1 0 0 0 0
7 0 0 0 0 0
8 3 0 0 1
9 2 0 0 0
10 1 0 0 1
11 6 0 0
12 6 0
13 9 0
14 4
15 5
16 5
17 4
18 0

Please help!