n = int(input())
cand = list(range(0,10))
for i in range(n):
    a,b,c,d,r = input().split()
    a=int(a);b=int(b);c=int(c);d=int(d)
    if r=="YES":
        cand = list(set(cand) & set([a,b,c,d]))
    else:
        cand = list(set(cand)-set([a,b,c,d]))
print(cand[0])