#include <stdio.h>

int main(void) {
	int i, N, A[7], B[7], C[7], D[7];
	int ans, num;
	char R[7][4];
	
	scanf("%d", &N);
	for(i = 1;i <= N;i++){
		scanf("%d%d%d%d%s", &A[i], &B[i], &C[i], &D[i], R[i]);
	}
	ans = 0;
	for(i = 0;i < 10;i++){
		ans = ans << 1;
		ans += 1;
	}
	//printf("%x\n", ans);

	for(i = 1;i <= N;i++){
		if(R[i][0] == 'Y'){
			num  = 1 << A[i];
			num += 1 << B[i];
			num += 1 << C[i];
			num += 1 << D[i];
			ans &= num;
		}
		else{
			if((ans >> A[i]) % 2 == 1)ans -= 1 << A[i];
			if((ans >> B[i]) % 2 == 1)ans -= 1 << B[i];
			if((ans >> C[i]) % 2 == 1)ans -= 1 << C[i];
			if((ans >> D[i]) % 2 == 1)ans -= 1 << D[i];
		}
		//printf("%x\n", num);
	}
	//printf("%x\n", ans);
	for(i = 0;i < 10;i++){
		if(ans % 2 == 1){
			printf("%d\n", i);
			break;
		}
		ans /= 2;
	}

	return 0;
}