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- user = list(input())
- symb = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '_']
- for i in user:
- if i in symb or i != i.upper(): # заглавные
- continue
- else:
- print('Неверный символ:', i)
- break
- else:
- print('OK')
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