11 lines
273 B
Python
11 lines
273 B
Python
class Solution(object):
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def solve(self, n:int) -> str:
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print(f"n: {n}")
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s = list(str(n))
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for i in range(len(s)):
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if s[i] != '4' and s[i] != '7':
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return "NO"
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return "YES"
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s = Solution()
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print(s.solve(47)) |