N = int(input())
nums = range(10)
for i in range(N):
    array = input().split()
    taro_nums = [int(i) for i in array[0:4]]
    result = array[4]
    if result == 'YES':
        nums = set(nums) - set(set(nums) - set(taro_nums))
    else:
        nums = set(nums) - set(taro_nums)

print(list(nums)[0])