How many possible 9-digit zip codes are possible if the first digit cannot be zero?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How many possible 9-digit zip codes are possible if the first digit cannot be zero?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
900,\!000,\!000
How many possible 9-digit zip codes are possible if the first digit cannot be zero?
train