d = {}
l = []
for i in range(10):
    d[chr(ord('0')+i)] = True
    l.append(chr(ord('0')+i))
n = int(raw_input())
for _ in range(n):
    m = raw_input().split()
    if m[-1] == 'YES':
        for c in l:
            if not c in m:
                d[c] = False
    else:
        for i in range(4):
            d[m[i]] = False
for n,b in d.items():
    if b:
        print n