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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int c=0;
  6. 	string s;
  7. 	cin >> s;
  8. 	for(int i=0;i<s.size();i++)
  9. 	{
  10. 		if(s[i]=='4' || s[i]=='7')
  11. 		c++;
  12. 	}
  13. 	if(c==4 || c==7)
  14. 	{
  15. 		cout << "YES" << endl;
  16. 	}
  17. 	else
  18. 	{
  19. 		cout << "NO" << endl;
  20. 	}
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 5328KB
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stdin
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7747774
stdout
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YES
https://ideone.com/avsY8x
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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