import java.util.*;
import java.io.*;

public class Main {
	public static void main (String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] first = br.readLine().split(" ", 2);
		int q = Integer.parseInt(first[0]);
		int k = Integer.parseInt(first[1]);
		ArrayList<Long> list = new ArrayList<>();
		PriorityQueue<Long> fore = new PriorityQueue<>();
		PriorityQueue<Long> rear = new PriorityQueue<>();
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < q; i++) {
		    String[] line = br.readLine().split(" ");
		    int type = Integer.parseInt(line[0]);
		    if (type == 1) {
		        long x = Long.parseLong(line[1]);
		        if (fore.size() < k - 1 || -fore.peek() > x) {
		            fore.add(-x);
		            if (fore.size() >= k) {
		                rear.add(-fore.poll());
		            }
		        } else {
		            rear.add(x);
		        }
		    } else {
		        if (rear.size() == 0) {
		            sb.append(-1);
		        } else {
		            sb.append(rear.poll());
		        }
		        sb.append("\n");
		    }
		}
		System.out.print(sb);
	}
}