15 lines
216 B
Python
15 lines
216 B
Python
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# -*- coding:utf-8 -*-
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# @Author len
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# @Create 2023/12/14 20:54
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# 输入字符串
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input_string = input("")
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string = input_string.lower()
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if len(set(string)) == len(string):
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print("YES")
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else:
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print("NO")
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