q, k = gets.split.map(&:to_i)
s = []
q.times{
	if v = gets.split.map(&:to_i)[1] then
		if s == [] || v >= s[-1] then
			s.push(v)
		elsif v <= s[0] then
			s.unshift(v)
		else
			for i in 0...s.size do
				if v > s[i] then
					s.insert(i, v)
					break
				end
			end
		end
	else
		puts s.size >= k ? s.delete_at(k - 1) : -1
	end
}