The answer to this will depend on how you are presenting the resulting text file. Your example shows writing to the Immediate Window. Are you actually writing to an ASCII text file?

Because you said you are printing strings (not numeric values) you can use
Format(s, "@@@")
to insert spaces to the left to pad out the string s to three characters.

Padding with spaces will work only if you are presenting this using a fixed-width font. If you are using a proportional font, this is going to be difficult/impossible.