n = int(input())

l = [6] * 10
for _ in range(n):
    a, b, c, d, r = input().split()
    l2 = [a, b, c, d]
    for i in l2:
        if r == 'NO':
            l[int(i)] -=1
        else:
            l[int(i)] += 1

print(l.index(max(l)))