N = int(input())
cnt = [0] * 10
for _ in range(N):
    Z = list(input().split())
    L = [int(Z[i]) for i in range(4)]
    R = Z[4]
    if R == 'NO':
        for i in L:
            cnt[i] = -1
    else:
        for i in L:
            if cnt[i] == -1:
                continue
            cnt[i] += 1
M = max(cnt)
for i in range(10):
    if cnt[i] == M:
        print(i)
        break