How many four-digit positive integers are there with thousands digit $2?$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How many four-digit positive integers are there with thousands digit $2?$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1000
How many four-digit positive integers are there with thousands digit $2?$
train