func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     int ans = 0;     while (n--) {       string t;       cin >> t;       int c = k;       for (char x : t)         if (x ==  4  || x ==  7 ) c--;       if (c >= 0) ans++;     }     cout << ans << endl;     return 0;   }   