n=int(input())
ary=[input().split() for _ in range(n)]
op=[1]*10
for x in ary:
    r=x[-1]
    x=list(map(int,x[:-1]))
    if r=="NO":
        for i in x:
            op[i]=0
    else:
        for i in range(10):
            if i not in x:
                op[i]=0
for i in range(10):
    if op[i]==1:
        print(i)
"""
3
1 2 4 3 NO
8 5 6 7 NO
0 1 2 3 NO

"""