#include <string>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <iomanip>
#include <ctime>
#include <valarray>
#include <iostream>
#include <sstream>
#include <fstream>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 2e5 + 10;

int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int tot = 1 << 10;
	int mask = tot - 1;
	int ans = mask;
	int n;
	cin >> n;
	while (n--)
	{
		int o = 0;
		for (int i = 0; i < 4; i++)
		{
			int x;
			cin >> x;
			o |= 1 << x;
		}
		string str;
		cin >> str;
		if (str == "NO") o ^= mask;
		ans &= o;
	}
	for (int i = 0; i < 10; i++)
	{
		if (ans >> i & 1)
		{
			cout << i << endl;
			break;
		}
	}
	return 0;
}