count = gets.chomp.to_i
list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
count.times do
	array = gets.split.map(&:to_s)
	if arg =~ /^[0-9]+$/
		array.each{|arg| array[-1] == "YES" ? list << arg.to_i : list.delete(arg.to_i)}
	end
end
puts list.uniq.sort{|x,y| list.count(y) <=> list.count(x) }[0]