def main():
    N = int(input())
    yes_list = []
    yes_count = 0
    no_list = []
    no_count = 0
    for i in range(N):
        l = input().split()
        if l[-1] == "YES": 
            yes_count += 1
            for j in range(4):
                yes_list.append(int(l[j]))
        else:
            no_count += 1
            for j in range(4):
                no_list.append(int(l[j]))

    #print("yes_list", yes_list)
    #print("no_list", no_list)

    maybe_yes_from_no_list = []
    for i in range(10):
        if i not in no_list:
            maybe_yes_from_no_list.append(i)

    #print("maybe_yes_from_no_list", maybe_yes_from_no_list)

    maybe_yes_from_yes_list = []
    for i in set(yes_list):
        if yes_list.count(i) == yes_count:
            maybe_yes_from_yes_list.append(i)

    #print("maybe_yes_from_yes_list", maybe_yes_from_yes_list)

    if len(maybe_yes_from_no_list) == 1:
        print(maybe_yes_from_no_list[0])
    elif len(maybe_yes_from_yes_list) == 1:
        print(maybe_yes_from_yes_list[0])
    else:
        intersection = set(maybe_yes_from_yes_list) & set(maybe_yes_from_no_list)
        print(list(intersection)[0])



if __name__ == '__main__':
    main()