def main():
    N = int(input())
    A = tuple(tuple(input().split()) for _ in range(N))

    num = [0] * 10
    for x in A:
        if x[-1] == 'YES':
            for i in range(4):
                num[int(x[i])] += 1
        else:
            for i in range(4):
                num[int(x[i])] -= 1

    ans = num.index(max(num))
    print(ans)

main()