#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main()
{
    int n, a[6][4];
    string r[6];
    cin >> n;
    for(int i=0; i<n; i++) cin >> a[i][0] >> a[i][1] >> a[i][2] >> a[i][3] >> r[i];

    int tmp[10] = {0};
    for(int i=0; i<n; i++){
        if(r[i] == "NO") {
            for(int j=0; j<4; j++){
                tmp[a[i][j]] = -1;
            }
        }
        else{
            for(int j=0; j<4; j++){
                if(tmp[a[i][j]] != -1) tmp[a[i][j]]++;
            }
        }
    }

    int ans = -1, tm = -1;
    for(int i=0; i<10; i++){
        if(tmp[i] != -1 && tmp[i] > tm){
            tm = tmp[i];
            ans = i;
        }
    }

    cout << ans << endl;        

    return 0;
}