N = int(input())

L = [1] * 10

for _ in range(N):
    q = [ i for i in input().split() ]
    
    if q[-1] == "NO":
        for i in q[:-1]:
            L[int(i)] *= 0
    else:
        for i in q[:-1]:
            L[int(i)] *= 2

max = 0
ans = 0

for i, l in enumerate(L):
    if l > max:
        ans = i       
        max = l

print(ans)