N = int(input())
think_number_dict = {str(i): 0 for i in range(0, 10)}
for _ in range(N):
    array = input().split()
    if array[-1] == 'YES':
        for i in array[:-1]:
            think_number_dict[i] += 1
    if array[-1] == 'NO':
        for j in array[:-1]:
            think_number_dict[j] -= 100
think_list = [k for k, v in think_number_dict.items() if v == max(think_number_dict.values())]
print(think_list[0])