c#include <bits/stdc++.h> using namespace std; int main(){ cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(false); int N; cin >> N; int cnt = 0; set<string> chat; for(int i = 0; i < N; i++){ string msg; cin >> msg; if(msg == "ENTER"){ cnt += chat.size(); chat.clear(); }else{ chat.insert(msg); } } cnt += chat.size(); cout << cnt << "\n"; return 0; }```