from collections import Counter
N=int(input())
string_list=[input() for i in range(N)]
B=[]
C=[]
D=[i for i in range(10)]
for i in range(N):
    A=string_list[i].split()
    if A[4]=="YES":
        B.append(A[:-1])
    else:
        C.append(A[:-1])

if len(B)==0:
    E=[int(fla) for ine in C for fla in ine]
    E=set(E)
    F=list(set(D) ^ E)
    print(F[0])
else:
    E=[fla for ine in B for fla in ine]
    counter = Counter(E)
    print(counter.most_common(1)[0][0])