def mainProc(lst):
    candidate = [i for i in range(10)]

    for l in lst :
        if l[1] == 'YES' :
            candidate = list(filter( lambda c : c in l[0] , candidate))
        elif l[1] == 'NO' :
            candidate = list(filter( lambda c : c not in l[0] , candidate))
    print(candidate[0])

if __name__ == '__main__':
    
    n = int(input())
    lst = []
    for i in range(n) :
        t_list = input().split()
        lst.append(([int(i) for i in t_list[:4]],t_list[4]))
    mainProc(lst)