N=int(input())
y_l=[]
n_l=[]
default=[0,1,2,3,4,5,6,7,8,9]
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=='NO':
        try:
            default.remove(A)
        except:
            pass
        try:
            default.remove(B)
        except:
            pass
        try:
            default.remove(C)
        except:
            pass
        try:
            default.remove(D)
        except:
            pass
    else:
        y_l.append(A)
        y_l.append(B)
        y_l.append(C)
        y_l.append(D)

import collections
c=collections.Counter(y_l)

if len(default)==1:
    print(default[0])
else:
    kaisu=c.most_common()[0][1]
    c={k: v for k, v in c.items() if v >= kaisu}
    y_l=list(c.keys())
    print(list(set(default)&set(y_l))[0])