n=int(input())
lst_yes=[0]*10
lst_no=[0]*10

for i in range(n):
    a,b,c,d,r=input().split()
    a,b,c,d,r=int(a),int(b),int(c),int(d),str(r)
    if r=="NO":
        lst_no[a]=lst_no[b]=lst_no[c]=lst_no[d]=1
    if r=="YES":
        lst_yes[a]+=1
        lst_yes[b]+=1
        lst_yes[c]+=1
        lst_yes[d]+=1
# print(lst_yes)
# print(lst_no)
def han():
    if lst_no.count(0)==1:return lst_no.index(0)
    ans_lst=[]
    ans1_lst=[]
    ans=0
    for i in range(10):
        if lst_no[i]==0:ans_lst.append(i)
    for j in ans_lst:
        ans=max(ans,lst_yes[j])
    for k in range(10):
        if lst_yes[k]==ans and lst_no[k]==0:return k

print(han())