all_number = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
input_line = int(input())
dubble = []
for i in range(input_line):
    number = input().split()
    if number[4] == 'NO':
        dubble.append(number[0])
        dubble.append(number[1])
        dubble.append(number[2])
        dubble.append(number[3])
nums_unique = list(set(dubble))
for i in nums_unique:
    all_number.remove(i)
print(all_number)