import sys
from itertools import islice, product


def solve(in_):
    N = int(next(in_))

    nums = frozenset(range(10))
    ans = set(range(10))
    for line in islice(in_, N):
        line = line.strip()
        it = iter(line.split())
        ABCD = set(map(int, islice(it, 4)))
        R = next(it)
        if R == b'YES':
            ans &= ABCD
        else:  # R == 'NO':
            ans &= (nums - ABCD)
    
    assert len(ans) == 1
    return ans.pop()
    

def main():
    answer = solve(sys.stdin.buffer)
    print(answer)


if __name__ == '__main__':
    main()