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(x) for y in C for x in y]
    E=set(E)
    F=list(set(D) ^ E)
    print(F[0])

else:
    E=[int(x) for y in C for x in y]
    E=set(E)
    F=[int(x) for y in B for x in y]
    F=set(F)
    G=list((F & E)^ F)
    print(G[0])