#include <stdio.h>

int main(void){
	int i;
	int N;
	
	int flag[10];
	
	int maxNum = -1;
	int ansNum = -1;
	
	for(i=0;i<10;i++){flag[i] = 1;}
	scanf("%d", &N);
	for(i=0;i<N;i++){
		int A,B,C,D;
		char R[10];
		scanf("%d %d %d %d", &A,&B,&C,&D);
		scanf("%s", R);
		
		if(R[0] == 'N'){
			flag[A] = 0;
			flag[B] = 0;
			flag[C] = 0;
			flag[D] = 0;
		}else{
			if(flag[A] != 0){flag[A]++;}
			if(flag[B] != 0){flag[B]++;}
			if(flag[C] != 0){flag[C]++;}
			if(flag[D] != 0){flag[D]++;}
		}
		
	}
	
	for(i=0;i<10;i++){
		if(flag[i] > maxNum ){
			maxNum = flag[i];
			ansNum = i;
		}
	}
	
	printf("%d\n", ansNum);
	return 0;
}