func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int r = 0, u = 0;     string s;     cin >> s;     for (int i = 0; i < s.size(); i++) {       if (s[i] ==  L )         r--;       else if (s[i] ==  R )         r++;       else if (s[i] ==  U )         u++;       else if (s[i] ==  D )         u--;     }     r *= r < 0 ? -1 : 1;     u *= u < 0 ? -1 : 1;     if ((r + u) % 2 == 0)       cout << (r + u) / 2;     else       cout << -1;     return 0;   }   