#include <bits/stdc++.h>
using namespace std;
int main() {
  char c[101];
  int count = 0;
  int sum = 0;
  while (cin.getline(c, 101)) {
    if (c[0] == '+') {
      count++;
      continue;
    }
    if (c[0] == '-') {
      count--;
      continue;
    }
    int x = 0;
    for (; c[x] != ':'; x++) {
    }
    sum += (strlen(c) - (x + 1)) * count;
  }
  cout << sum;
}
