import java.io.BufferedReader; import java.io.Closeable; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Comparator; import java.util.HashMap; import java.util.HashSet; import java.util.LinkedList; import java.util.ListIterator; import java.util.Map.Entry; import java.util.PriorityQueue; import java.util.Scanner; import java.util.StringTokenizer; import java.util.TreeMap; import java.util.TreeSet; public class Main { public static void main(String[] args) throws IOException { try (Scanner sc = new Scanner(System.in)) { final long Q = sc.nextLong(); final long K = sc.nextLong(); PriorityQueue main_queue = new PriorityQueue(Collections.reverseOrder()); PriorityQueue other_queue = new PriorityQueue(); for(int i = 0; i < Q; i++){ final int q = sc.nextInt(); if(q == 1){ final long v = sc.nextLong(); //System.out.println(v + " " + main_queue + " " + other_queue); main_queue.add(v); while(main_queue.size() > K){ other_queue.add(main_queue.poll()); } }else{ if(main_queue.size() < K){ System.out.println(-1); }else{ final long v = main_queue.poll(); System.out.println(v); if(!other_queue.isEmpty()){ main_queue.add(other_queue.poll()); } } } } } } public static class Scanner implements Closeable { private BufferedReader br; private StringTokenizer tok; public Scanner(InputStream is) throws IOException { br = new BufferedReader(new InputStreamReader(is)); } private void getLine() throws IOException { while (!hasNext()) { tok = new StringTokenizer(br.readLine()); } } private boolean hasNext() { return tok != null && tok.hasMoreTokens(); } public String next() throws IOException { getLine(); return tok.nextToken(); } public int nextInt() throws IOException { return Integer.parseInt(next()); } public long nextLong() throws IOException { return Long.parseLong(next()); } public double nextDouble() throws IOException { return Double.parseDouble(next()); } public int[] nextIntArray(int n) throws IOException { final int[] ret = new int[n]; for (int i = 0; i < n; i++) { ret[i] = this.nextInt(); } return ret; } public long[] nextLongArray(int n) throws IOException { final long[] ret = new long[n]; for (int i = 0; i < n; i++) { ret[i] = this.nextLong(); } return ret; } public void close() throws IOException { br.close(); } } }