func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, dig = 0, rem;     cin >> n;     while (n != 0) {       rem = n % 10;       if (rem == 4 || rem == 7) {         dig++;       }       n = n / 10;     }     if (dig == 4 || dig == 7)       cout <<  YES ;     else       cout <<  NO ;   }   