# -*- coding: utf-8 -*-

if __name__ == '__main__':
    N = int(input())
    turn = []
    for i in range(N):
        turn.append(list(input().split()))

    # YESの数字の積集合を取り，NOの数字の和集合を取る
    yes_intersection = {0,1,2,3,4,5,6,7,8,9}
    no_union = set([])
    for i in range(N):
        turn_set = set(list(map(int, turn[i][:4])))
        if turn[i][4] == 'YES':
            yes_intersection = yes_intersection.intersection(turn_set)
        else:
            no_union = no_union.union(turn_set)
    # NOの和集合の排他集合を取る
    ex_no = {0,1,2,3,4,5,6,7,8,9}.difference(no_union)
    # YESの積集合とex_noの積集合で残る要素が答え
    print(yes_intersection.intersection(ex_no).pop())