input_list = input().split()

possible_list = list(range(0, 10))
for i in range(1, int(input_list[0]) + 1): 
    if input_list[5 * i] == "YES":  
        possible_list = list(set(possible_list) & set(map(int, input_list[(5 * i - 4):(5 * i)])))  
    elif input_list[5 * i] == "NO":  
        possible_list = list(set(possible_list) - set(map(int, input_list[(5 * i - 4):(5 * i)])))  

print(possible_list[0])