N = int(input())
ABCDR = [input().split() for _ in range(N)]
dp = [True for _ in range(10)]
for a, b, c, d, r in ABCDR:
    a=int(a)
    b=int(b)
    c=int(c)
    d=int(d)
    if r=="YES":
        for i in range(10):
            if i not in [a, b, c, d]:
                dp[i]=False
    else:
        dp[a]=False
        dp[b]=False
        dp[c]=False
        dp[d]=False
ans = dp.index(True)
print(ans)