system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Please classify each of the following as numbers or letters: 1, A, 5, B, C, D, 99, 88, -2, Z, E, 4


assistant
These are numbers: 1, 5, 99, 88, -2, 4.
These are letters: A, B, C, D, Z, E.