import re
 
def classify_token(token):
    if re.match(r'^[a-zA-Z_]\w*$', token): return "Identifier"
    if token in {"int", "float", "char"}: return "Keyword"
    if re.match(r'^\d+$', token): return "Integer"
    if re.match(r'^\d+\.\d+$', token): return "Float"
    if token in {'+', '-', '*', '/', '=', '<', '>'}: return "Operator"
    return "Unknown"
 
with open("input.c", "r") as file:
    content = file.read()
    tokens = re.findall(r'\w+|[^\w\s]', content)
    for token in tokens:
        print(f"Token: {classify_token(token)}")
 

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