N = int(input())
yes = []
no = []
for n in range(N):
    L = input().split()
    if L[-1] == 'YES':
        yes.extend(L[0:4])
    else:
        no.extend(L[0:4])

if len(yes) == 0:
    for i in range(10):
        if not str(i) in no:
            print(i)
elif len(no) != 0:
    for n in no:
        if n in yes:
            yes.remove(n)
    count = 0
    ans = ''
    for i in range(10):
        if yes.count(str(i)) > count:
            count = yes.count(str(i))
            ans = i
    print(ans)

else:
    count = 1
    ans = ''
    for i in range(10):
        if yes.count(str(i)) > count:
            count = yes.count(str(i))
            ans = i
    print(ans)