func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s, s1;     int count1 = 0, count2 = 0;     cin >> s >> s1;     for (int i = 0; i < s.size(); i++) {       if (s[i] != s1[i]) {         if (s[i] ==  4 )           count1++;         else           count2++;       }     }     if (count1 <= count2)       cout << count2;     else       cout << count1;     cin.get();     return 0;   }   