import collections
n=int(input())
l=[i for i in range(10)]
nl=[]
for i in range(n):
    s=input().split()
    if s[4]=="NO":
        t=list(map(int,s[:4]))
        for j in t:
            if j in l:
                l.remove(j)
    elif s[4]=="YES":
        t=list(map(int,s[:4]))
        for j in t:
            if j in l:
                nl.append(j)

if len(l)==1:
    print(l[0])
else:
    dd = collections.Counter([x for x in nl if x in l])
    print(dd.most_common()[0][0])