turn = int(input())

trials = []
for i in range(turn):
    trials.append(input().split())

applicant = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

for trial in trials:
    number = {int(trial[0]), int(trial[1]), int(trial[2]), int(trial[3])}
    isInclude = trial[4]

    if isInclude == "NO":
        wrongNumber = number
    elif isInclude == "YES":
        wrongNumber = applicant - number
    applicant = applicant.difference(wrongNumber)
result = list(applicant)
print(int(result[0]))