If $10^{51} - 9$ is written as an integer in standard form, what is the sum of the integer's digits?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $10^{51} - 9$ is written as an integer in standard form, what is the sum of the integer's digits?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
451
If $10^{51} - 9$ is written as an integer in standard form, what is the sum of the integer's digits?
train