using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{

    public void Proc()
    {
        int[] inpt = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();

        int q = inpt[0];
        int k = inpt[1];

        SortedDictionary<long, int> primaryList = new SortedDictionary<long, int>();
        SortedDictionary<long, int> secandaryList = new SortedDictionary<long, int>();

        int itemCount = 0;
        StringBuilder ans = new StringBuilder();
        for (int i = 0; i < q; i++) {
            long[] tmp = Reader.ReadLine().Split(' ').Select(a => long.Parse(a)).ToArray();
            if(tmp[0]==1) {
                long num = tmp[1];
                if(itemCount>=k) {
                    if(primaryList.Keys.Last()>=num) {
                        if(primaryList.ContainsKey(num)) {
                            primaryList[num]++;
                        } else {
                            primaryList.Add(num, 1);
                        }
                        itemCount++;
                        while(itemCount>k) {
                            long key = primaryList.Last().Key;
                            if(primaryList[key]<=1) {
                                primaryList.Remove(key);
                            }  else {
                                primaryList[key]--;
                            }
                            itemCount--;
                            if(secandaryList.ContainsKey(key)) {
                                secandaryList[key]++;
                            } else {
                                secandaryList.Add(key, 1);
                            }
                        }
                    } else {
                        if(secandaryList.ContainsKey(num)) {
                            secandaryList[num]++;
                        } else {
                            secandaryList.Add(num, 1);
                        }
                    }
                } else {
                    if(primaryList.ContainsKey(num)) {
                        primaryList[num]++;
                    } else {
                        primaryList.Add(num, 1);
                    }
                    itemCount++;
                }
            } else {
                if(itemCount<k) {
                    ans.AppendLine("-1");
                } else {
                    long key = primaryList.Last().Key;
                    ans.AppendLine(key.ToString());
                    if(primaryList[key]<=1) {
                        primaryList.Remove(key);
                    } else {
                        primaryList[key]--;
                    }
                    if(secandaryList.Count>0) {
                        long addKey = secandaryList.First().Key;
                        if(primaryList.ContainsKey(addKey)) {
                            primaryList[addKey]++;
                        } else {
                            primaryList.Add(addKey, 1);
                        }
                        if(secandaryList[addKey]<=1) {
                            secandaryList.Remove(addKey);
                        } else {
                            secandaryList[addKey]--;
                        }
                    } else {
                        itemCount--;
                    }
                }
            }
        }
        Console.Write(ans.ToString());
    
    
    }



    public class Reader
    {
        private static StringReader sr;
        public static bool IsDebug = false;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (sr == null)
                {
                    sr = new StringReader(InputText.Trim());
                }
                return sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        private static string InputText = @"



1 1
2



";
    }

    public static void Main(string[] args)
    {
#if DEBUG
        Reader.IsDebug = true;
#endif
        Program prg = new Program();
        prg.Proc();
    }
}