N = int(input())
log = [list(map(lambda x: int(x) if x.isdigit() else x,input().split())) for i in range(N)]
res = [1] * 10

for l in log:
    n_set = set(l[:4])
    for i in range(10):
        if l[4] == "YES":
            if not i in n_set:
                res[i] &= 0
        else:
            if i in n_set:
                res[i] &= 0
                
print(res.index(1))