N=int(input())
cand_y=[0 for _ in range(10)]
cand_n=[1 for _ in range(10)]
for _ in range(N):
    A,B,C,D,R=input().split()
    if R=="YES":
        cand_y[int(A)]+=1
        cand_y[int(B)]+=1
        cand_y[int(C)]+=1
        cand_y[int(D)]+=1
    if R=="NO":
        cand_n[int(A)]=0
        cand_n[int(B)]=0
        cand_n[int(C)]=0
        cand_n[int(D)]=0
if sum(cand_n)==1:
    for i in range(10):
        if cand_n[i]==1:
            print(i);exit()
mx=-1
ans=-1
for i in range(10):
    if cand_n[i]==0:cand_y[i]=0
    if cand_y[i]>mx:
        mx=cand_y[i]
        ans=i
print(ans)