ary = Array.new(10)
N = gets.to_i
N.times do
    tmp = gets.split
    nums = tmp[0..-2].map(&:to_i)
    answer = tmp[-1]
    if answer == 'YES'
        ary.each_with_index do |status, idx|
            if nums.index(idx) and ary[idx].nil?
                ary[idx] = true
            else
                ary[idx] = false
            end
        end
    else
        nums.each{ |num| ary[num] = false }
    end
end
puts (ary.index(true) || ary.index(nil))