#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m = 0, k = 0, l;
  size_t p;
  string a, b;
  while (getline(cin, a)) {
    if (a[0] == '+')
      m++;
    else if (a[0] == '-')
      m--;
    else {
      k += m * (a.size() - a.find(':') - 1);
    }
  }
  cout << k << endl;
  return 0;
}
