How many of the letters in MATHCOUNTS have a horizontal line of symmetry?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How many of the letters in MATHCOUNTS have a horizontal line of symmetry?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
How many of the letters in MATHCOUNTS have a horizontal line of symmetry?
train