1000
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Compute $55^2 - 45^2$ in your head.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1000
Compute $55^2 - 45^2$ in your head.
train