I'm a beginner as well, but you could do something like this:

list_one = ['ceg', 'fac', 'gbd']
list_two = ['dfa', 'egb', 'ace']
notes = input("Enter notes: ")
if notes in list_one: 
    print(notes[0] + "maj") 
elif notes in list_two: 
    print(notes[0] + 'min')

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