<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 The library has 37,835 books. Over the summer, they sold some books. If only 143 out of 271 of the books are left, how many did they sell? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
128
The library has 37,835 books. Over the summer, they sold some books. If only 143 out of 271 of the books are left, how many did they sell?
test