import numpy as np

N = int(input())
cnt = np.zeros(10)

for i in range(N):
    A = [str(i) for i in input().split()]
    if(A[4] == 'YES'):
        for j in range(4):
            cnt[int(A[j])] += 1
    if(A[4] == 'NO'):
        for j in range(4):
            cnt[int(A[j])] -= 1

print(np.argmax(cnt))