# coding: utf-8
N = int(input())
ABCDR = [input().split() for __ in range(N)]
ans = [1] * 10
for abcdr in ABCDR:
    s_abcd = set(map(int, abcdr[:4]))
    r = abcdr[4]
    for i in range(10):
        if r == "YES":
            if i in s_abcd:
                ans[i] &= 1
            else:
                ans[i] &= 0
        else:
            if i in s_abcd:
                ans[i] &= 0
            else:
                ans[i] &= 1
print(ans.index(1))