#include <bits/stdc++.h>
using namespace std;
using vi = vector<int>;
using vvi = vector<vi>;
using ii = pair<int, int>;
using vii = vector<ii>;
using l = long long;
using vl = vector<l>;
using vvl = vector<vl>;
using ll = pair<l, l>;
using vll = vector<ll>;
using vvll = vector<vll>;
using lu = unsigned long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vd = vector<double>;
using vvd = vector<vd>;
const int INF = numeric_limits<int>::max();
const double EPS = 1e-10;
const l e0 = 1, e3 = 1000, e5 = 100000, e6 = e3 * e3, e7 = 10 * e6,
        e8 = 10 * e7, e9 = 10 * e8;
const bool enable_log = false;
struct VoidStream {
  void operator&(std::ostream&) {}
};
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  string s;
  while (cin >> s) {
    unordered_map<string, l> m;
    stack<string> path;
    string name = "";
    l answer = 0;
    for (auto c : s) {
      if (c == ':' or (c == '.' and not name.empty())) {
        answer += m[name];
        m[name]++;
        path.emplace(name);
        name = "";
      }
      if (c == '.') {
        m[path.top()]--;
        path.pop();
      }
      if (c >= 'A' and c <= 'Z') name += c;
    }
    cout << answer << '\n';
  }
}
