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

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

        int teamCount = inpt[0];
        int passCount = inpt[1];

        Dictionary<int, Dictionary<int, Dictionary<int, int>>> dic = new Dictionary<int, Dictionary<int, Dictionary<int, int>>>();
        Dictionary<int, int> univCount = new Dictionary<int, int>();
        for(int i=0; i<teamCount; i++) {
            inpt = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();
            if(!dic.ContainsKey(inpt[0])) {
                dic.Add(inpt[0], new Dictionary<int, Dictionary<int, int>>());
            }
            if(!dic[inpt[0]].ContainsKey(inpt[2])) {
                dic[inpt[0]].Add(inpt[2], new Dictionary<int, int>());
            }
            dic[inpt[0]][inpt[2]][inpt[1]] = i;
            univCount[inpt[2]] = 0;
        }
        
        
        int cnt = 0;
        StringBuilder ans = new StringBuilder();
        foreach(int acCount in dic.Keys.OrderByDescending(a=>a)) {
            if(cnt >= passCount) {
                break;
            }
            int must = Math.Min(passCount-cnt, dic[acCount].Sum(a=>a.Value.Count()));
            for(int i=0; i<must; i++) {
                int univ = -1;
                int[] un = dic[acCount].Keys.OrderBy(a=>univCount[a]).ToArray();
                un = un.Where(a=>a==un.Max()).ToArray();
                un = un.OrderBy(a=>dic[acCount][a].Min(b=>b.Key)).ToArray();
                univ = un[0];
                int penalty = dic[acCount][univ].Keys.Min();
                ans.AppendLine(dic[acCount][univ][penalty].ToString());
                univCount[univ]++;
                cnt++;
                dic[acCount][univ].Remove(penalty);
                if(dic[acCount][univ].Count == 0) {
                    dic[acCount].Remove(univ);
                }
            }
        } 
        Console.Write(ans.ToString());

    }


    public class Reader {
        public static bool IsDebug = true;
        private static System.IO.StringReader SReader;
        private static string InitText = @"


5 3
3 100 1
4 200 1
4 300 1
3 150 2
2 50 2

";
        public static string ReadLine() {
            if(IsDebug) {
                if(SReader == null) {
                    SReader = new System.IO.StringReader(InitText.Trim());
                }
                return SReader.ReadLine();
            } else {
                return Console.ReadLine();
            }
        }

    }
    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}