#include <cstdio>

#define FOR(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define REV(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define INC0(i, n) FOR(i, 0, n)
#define INC1(i, n) FOR(i, 1, (n) + 1)
#define DEC0(i, n) REV(i, 0, n)
#define DEC1(i, n) REV(i, 1, (n) + 1)

typedef long long   signed int LL;
typedef long long unsigned int LU;


int n, e[10], cnt;

int main() {
	scanf("%d", &n);
	INC0(i, n) {
		int a, b, c, d;
		char r[4];
		scanf("%d%d%d%d%s", &a, &b, &c, &d, r);
		
		if(r[0] == 'Y') {
			cnt++;
			e[a]++;
			e[b]++;
			e[c]++;
			e[d]++;
		} else {
			e[a]--;
			e[b]--;
			e[c]--;
			e[d]--;
		}
	}
	
	int ans;
	INC0(i, 10) {
		if(e[i] == cnt) { ans = i; } 
	}
	
	printf("%d\n", ans);
	
	return 0;
}