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

public class Program
{

    public void Proc()
    {
        int[] qk = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();
        int q = qk[0];
        int k = qk[1];

        SortedDictionary<long, int> first = new SortedDictionary<long, int>();
        SortedDictionary<long, int> second = new SortedDictionary<long, int>();
        int itemCount = 0;
        StringBuilder ans = new StringBuilder();
        for (int i = 0; i < q; i++) {
            long[] inpt = Reader.ReadLine().Split(' ').Select(a => long.Parse(a)).ToArray();
            if(inpt[0]==1) {
                long num = inpt[1];
                if(itemCount>=k-1) {
                    if(second.ContainsKey(num)) {
                        second[num]++;
                    } else {
                        second.Add(num, 1);
                    }
                } else {
                    if(first.ContainsKey(num)) {
                        first[num]++;
                    } else {
                        first.Add(num, 1);
                    }
                }
                itemCount++;
            } else {
                if(second.Count<=0) {
                    ans.AppendLine("-1");
                } else {
                    long num = second.First().Key;
                    ans.AppendLine(num.ToString());
                    if(--second[num]<=0) {
                        second.Remove(num);
                    }
                    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 = @"





13 3
1 0
1 0
1 0
1 0
1 0
1 0
2
2
2
2
2
2
2




";
    }

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