#include<algorithm>
#include<complex>
#include<ctype.h>
#include<iomanip>
#include<iostream>
#include<fstream>
#include<map>
#include<math.h>
#include<numeric>
#include<queue>
#include<set>
#include<stack>
#include<stdio.h>
#include<string>
#include<string>
#include<vector>

using namespace std;
typedef long long ll;

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

template < typename T >
void vprint(T &V){
	for(auto v : V){
    	cout << v << " ";
	}
	cout << endl;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll N;
    cin >> N;

    // possibility
    vector<bool> P(10, true);

    FOR(i, 0, N){
        ll a, b, c, d;
        string r;

        cin >> a >> b >> c >> d >> r;
        vector<ll> V;
        V.push_back(a);
        V.push_back(b);
        V.push_back(c);
        V.push_back(d);

        map<ll, bool> mp;
        mp[a] = true;
        mp[b] = true;
        mp[c] = true;
        mp[d] = true;

        if(r=="NO"){
            for(ll v : V){
                P[v] = false;
            }
        }else{
            // それ以外をバツ
            FOR(j, 0, 10){
                if(!mp[j]){
                    P[j] = false;
                }
            }
        }
    }

    FOR(i, 0, 10){
        if(P[i]){
            p(i);
            return 0;
        }
    }
    
    return 0;
}