5A - Chat Servers Outgoing Traffic - CodeForces Solution

/*
⠛⠛⣿⣿⣿⣿⣿⡷⢶⣦⣶⣶⣤⣤⣤⣀⠀⠀⠀
⠀⠀⠀⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⡀⠀
⠀⠀⠀⠉⠉⠉⠙⠻⣿⣿⠿⠿⠛⠛⠛⠻⣿⣿⣇⠀
⠀⠀⢤⣀⣀⣀⠀⠀⢸⣷⡄⠀⣁⣀⣤⣴⣿⣿⣿⣆
⠀⠀⠀⠀⠹⠏⠀⠀⠀⣿⣧⠀⠹⣿⣿⣿⣿⣿⡿⣿
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠛⠿⠇⢀⣼⣿⣿⠛⢯⡿⡟
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠦⠴⢿⢿⣿⡿⠷⠀⣿⠀
⠀⠀⠀⠀⠀⠀⠀⠙⣷⣶⣶⣤⣤⣤⣤⣤⣶⣦⠃⠀
⠀⠀⠀⠀⠀⠀⠀⢐⣿⣾⣿⣿⣿⣿⣿⣿⣿⣿⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠈⣿⣿⣿⣿⣿⣿⣿⣿⣿⡇⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⠻⢿⣿⣿⣿⣿⠟⠁
*/
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define Endl endl
#define ll long long
#define in insert
#define F first
#define S second
#define py() printf("YES\n")
#define pn() printf("NO\n")
#define loop(i,n) for(int i = 0 ; i < n ; i++)
#define lop(i, x, n) for(int i = x ; i <= n ; i++)
#define all(v) v.begin(), v.end()
#define sz(v) (int)v.size()

int ans, cnt;
string s;

void solve(){

    while(getline(cin, s)){
        if(s[0] == '+') cnt++;

        else if(s[0] == '-') cnt--;

        else ans += cnt * (sz(s) - s.find(':') - 1);
    }

    printf("%d", ans);
}

int main(){

    int tt = 1;
    while(tt--){
        solve();
    }

    return 0;
}