#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N; cin >> N;
    int S = (1<<10)-1,yes = 0;
    while(N--){
        int a,b,c,d; cin >> a >> b >> c >> d;
        int T = (1<<a)+(1<<b)+(1<<c)+(1<<d);
        string s; cin >> s;
        if(s.at(0) == 'Y') S &= T;
        else S &= ~T;
    }
    cout << __builtin_ffs(S)-1 << endl;
}