n = int(input())

ans = [1] * 10

for _ in range(n):
    li = list(input().split())
    nums = list(map(int, li[:4]))
    yn = li[4]

    if yn == "YES":
        for num in range(10):
            if num not in nums:
                ans[num] = 0
    else:
        for num in nums:
            ans[num] = 0

print(ans.index(1))