#include <bits/stdc++.h>

typedef long long ll;
#define rep(i, b) for(int i = 0; i < b; i++)
#define repi(i, a, b) for(int i = a; i < b; i++)
#if defined(_MSC_VER) || __cplusplus > 199711L
#define aut(r,v) auto r = (v)
#else
#define aut(r,v) __typeof(v) r = (v)
#endif
#define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it)
#define MAX_V 1001
#define MAX_E 401
#define MOD 1000000007
#define EPS 1e-5
#define INF INT_MAX
#define PI 3.141
inline ll toll(std::string s) { ll v; std::istringstream sin(s); sin >> v; return v; }
template<class T> inline std::string toString(T x) { std::ostringstream sout; sout << x; return sout.str(); }
using namespace std;
typedef pair<int, int> pii;

int main()
{
	vector<int> num(10, 1);
	int N;
	cin >> N;

	rep(i, N)
	{
		int A[4];
		string s;
		rep(j, 4)
		{
			cin >> A[j];
		}
		cin >> s;

		if (s == "NO")
		{
			rep(j, 4)
			{
				num[A[j]] = 0;
			}
		}
		else{
			rep(j, 4)
			{
				if (num[A[j]] != 0)
				{
					num[A[j]]++;
				}
			}
		}
	}

	int Max = 0,res = 0;
	rep(i, 10)
	{
		if (Max < num[i])
		{
			res = i;
			Max = num[i];
		}
	}
	cout << res << endl;
	return 0;
}