#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>

int main()
{
	enum SUCCESS
	{
		NONE,
		YES,
		NO,
	};

	int turn = 0;
	int nums[10] = { 0 };
	int isExist = false;
	int ans = 0;

	scanf("%d", &turn);

	for (int i = 0;i < turn;i++)
	{
		char str[10] = "";
		int num[4] = {0};
		for (int j = 0;j < 4;j++)
		{
			scanf("%d", &num[i]);
		}
		
		scanf("%s", str);
		if (str == "YES")
		{
			for (int j = 0;j < 4;j++)
			{
				nums[num[j]]++;
			}
		}
		else
		{
			for (int j = 0;j < 4;j++)
			{
				nums[num[j]]--;
			}
		}
	}

	for (int i = 0;i < 10;i++)
	{
		int tmp = nums[i];
		if (nums[tmp] > nums[ans])
		{
			ans = tmp;
		}
	}
	
	printf("%d\n",ans);
	
	return 0;
}