# -*- coding: utf-8 -*-

n = int(input())
a = [0] * n
b = [0] * n
c = [0] * n
d = [0] * n
r = [0] * n
for i in range(n):
    a[i],b[i],c[i],d[i],r[i] = input().split()
    a[i] = int(a[i])
    b[i] = int(b[i])
    c[i] = int(c[i])
    d[i] = int(d[i])

answer = [0,1,2,3,4,5,6,7,8,9]
answer = set(answer)

for i in range(n):
    if r[i] == "YES":
        temp = [a[i],b[i],c[i],d[i]]
        temp = set(temp)
        answer = answer & temp
    else:
        temp = [a[i],b[i],c[i],d[i]]
        temp = set(temp)
        answer = answer - temp

answer = list(answer)
print(answer[0])