ans = set([i for i in range(10)])

n = int(input())
for i in range(n):
    nums, r = input().rsplit(None, 1)
    nums = set(map(int, nums.split()))
    
    if r == 'YES':
        ans &= nums
    elif r == 'NO':
        ans -= nums
        
for a in ans:
    print(a)