func_code_string: #include <bits/stdc++.h>   using namespace std;   bool Caps(string a) {     for (int i = 0; i < a.size(); i++)       if (a.at(i) < 65 && a.at(i) > 90) return false;     return true;   }   int main() {     long long n, cnt = 0;     cin >> n;     while (n > 0) {       int rem = n % 10;       if (rem == 4 || rem == 7) {         cnt++;       }       n /= 10;     }     if (cnt == 4 || cnt == 7)       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   