package yuki183;

import java.util.Collections;
import java.util.PriorityQueue;
import java.util.Scanner;


public class D {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int q = sc.nextInt();
		int k = sc.nextInt();
		PriorityQueue<Long> maxheap = new PriorityQueue<>(k, Collections.reverseOrder());
		PriorityQueue<Long> minheap = new PriorityQueue<>(200000);
		StringBuilder ans = new StringBuilder();
		for(int i=0; i<q; i++) {
			int com = sc.nextInt();
			if(com==1) {
				long v = sc.nextLong();
				if(maxheap.size()<k) {
					maxheap.add(v); continue;
				}
				if(!maxheap.isEmpty()) {
					long a = maxheap.peek();
					if(a<v) {
						minheap.add(v);
					} else {
						maxheap.add(v);
						long b = maxheap.poll();
						minheap.add(b);
					}
				} else {
					maxheap.add(v);
				}
			} else {
				if(maxheap.size()<k) {
					ans.append(-1 + "\n");
				} else {
					long a = maxheap.poll();
					ans.append(a + "\n");
					if(!minheap.isEmpty()) {
						long b = minheap.poll();
						maxheap.add(b);
					}
				}
			}
		}
		System.out.println(ans.toString());
	}
}