Find the sum of the digits of the base-8 expression for $8888_{10}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the sum of the digits of the base-8 expression for $8888_{10}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
Find the sum of the digits of the base-8 expression for $8888_{10}$.
train