N = int(input())
YES = [0]*10
NO = [0]*10
for _ in range(N):
    q = input().split()
    num = list(map(int, q[:4]))
    R = q[4]
    if R == 'YES':
        for i in num: YES[i] += 1
    if R == 'NO':
        for i in num: NO[i] += 1
if sum(NO) == N*4:
    print(NO.index(0))
else:
    for i in range(10):
        if NO[i]: YES[i] = 0
    print(YES.index(max(YES)))