[Help-bash] have the same column L

[Val Krem]

Hi all,

How can I starndarzied string column to have the same column length for each 
row.

Example 
filename

A135953
D10036050
C135858000

I want add leading zeros and the column length should be 10 

I tried 
awk '{ printf "%010s \n", $1}' filename

Got all zeros
0000000000 
0000000000 
0000000000 
0000000000 

But I want
000A135953
0D10036050
C135858000


I would appreciate if you help me out.

thank you in advance