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