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]);
    	StringBuilder sb = new StringBuilder();
    	ArrayList<Long> list = new ArrayList<>();
    	list.add(0L);
    	list.add(Long.MAX_VALUE);
    	for (int i = 0; i < q; i++) {
    	    String s = br.readLine();
    	    if (s.charAt(0) == '1') {
    	        long x = Long.parseLong(s.split(" ", 2)[1]);
    	        int left = 0;
    	        int right = list.size();
    	        while (right - left > 1) {
    	            int m = (left + right) / 2;
    	            if (list.get(m) < x) {
    	                left = m;
    	            } else {
    	                right = m;
    	            }
    	        }
    	        list.add(right, x);
    	    } else {
    	        if (list.size() < k + 2) {
    	            sb.append(-1);
    	        } else {
    	            sb.append(list.remove(k));
    	        }
    	        sb.append("\n");
    	    }
    	}
	    System.out.print(sb);
    }
}