#include <stdio.h>
#include <string.h>

int main() {
	int n, abcd[4][6], num[10] = {}, max, i, j;
	char r[6][4];

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		for (j = 0; j < 4; j++) {
			scanf("%d", &abcd[j][i]);
		}
		scanf("%s", &r[i]);
		if (strcmp(r[i], "YES") == 0) {
			for (j = 0; j < 4; j++) {
				if (num[abcd[j][i]] != -1) num[abcd[j][i]]++;
			}
		}
		else {
			for (j = 0; j < 4; j++) {
				num[abcd[j][i]] = -1;
			}
		}
	}

	max = num[0];
	for (i = 1; i < 10; i++) {
		if (num[i - 1] < num[i]) max = i;
	}

	printf("%d\n", max);

	return 0;
}