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[#7] Feat: 단어 공부
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1157.py

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# 단어 공부
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word = input().upper()
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dict_letter = {}
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for letter in word:
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if letter not in dict_letter:
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dict_letter[letter] = 1
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else:
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dict_letter[letter] += 1
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# 최대값을 뽑아주지만, 제일 앞 쪽에 있는 하나만 뽑아준다.
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# print(max(dict_letter, key=dict_letter.get))
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# 여러개를 체크하려면, 리스트 컴프리핸션을 써야한다.
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result = [k for k, v in dict_letter.items() if max(dict_letter.values()) == v]
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if len(result) > 1:
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print('?')
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else:
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print(result[0])

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