N = int(input())
L = [6] * 10

for _ in range(N):
    I = input().split()
    if I[-1] == 'NO':
        for i in range(4):
            L[int(I[i])] -= 6
    else:
        for i in range(4):
            L[int(I[i])] += 1

print(L.index(max(L)))