N = int(input())
log = [list(map(lambda x: int(x) if x.isdigit() else x,input().split())) for i in range(N)]
res = [i for i in range(10)]

for l in log:
    if l[4] == 'YES':
        rl = [j for j in range(10) if not j in l[0:4]]
        for k in rl:
            try:
                res.remove(k)
            except ValueError:
                pass
    else:
        for i in range(4):
            try:
                res.remove(l[i])
            except ValueError:
                pass
    if len(res) == 1:
        print(res[0])
        exit()