#include <bits/stdc++.h>
using namespace std;
string thing;
long long people,flow;
int main()
{
while(getline(cin,thing))
{
if(thing[0]=='+') people++;
else if(thing[0]=='-') people--;
else
{
for(int i=0;i<thing.size();i++)
{
if(thing[i]==':')
{
flow+=(thing.size()-i+1)*people;
break;
}
}
}
}
cout<<flow;
return 0;
}