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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <map>
  4. #include <vector>
  5. #include <cstdio>
  6.  
  7. using namespace std;
  8.  
  9. int main()
  10. {
  11. 	long long n; cin >>n;
  12. 	short c=0;
  13. 	while(n) {
  14. 		if( n%10==4 || n%10==7) c++;
  15. 		n /= 10;
  16. 	}
  17.  
  18. 	puts( (c==4||c==7)?"YES":"NO" );
  19.  
  20. }
Success #stdin #stdout 0s 3344KB
comments (?)
stdin
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1000000000000000000
stdout
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NO
https://ideone.com/fS5eup
Codeforces Easy
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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