N = int(input())
A = []
num = [0] * 10
judge = [True] * 10

for j in range(N):
    A.append(list(map(str, input().split())))

for j in range(N):
    if A[j][4] == "YES":
        for i in range(4):
            num[int(A[j][i])] += 1
    else:
        for i in range(4):
            judge[int(A[j][i])] = False

maximum = -1

for i in range(10):
    if judge[i] :
        if maximum < num[i]:
            maximum = num[i]
            ansnum = i

print(ansnum)