func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     int n = s.size(), c = 0, c1 = 0, k = 0, k1 = 0;     if (n % 2 != 0)       cout << -1;     else {       for (int i = 0; i < n; i++) {         if (s[i] ==  R )           c++;         else if (s[i] ==  L )           c1++;         else if (s[i] ==  U )           k++;         else if (s[i] ==  D )           k1++;       }       n = abs(c - c1) + abs(k - k1);       n = n / 2;       cout << n;     }     return 0;   }   