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

namespace yuki_433
{
    class Program
    {
        static int N, K;
        static HashSet<University> L = new HashSet<University>();
        static int[] C = new int[100001];
        static int Counter;
        static bool flag;

        static void Main(string[] args)
        {
            var sb = new StringBuilder();
            var t = scan;
            N = t[0]; K = t[1];


            for (int i = 0; i < N; i++)
            {
                t = scan;
                L.Add(new University(i,t[0], t[1], t[2]));
            }

            var A = L.OrderByDescending(l => l.S).ToArray();
            var d = 0;
            var T = A;


            while (true)
            {
                T = A.Skip(d).ToArray();
                T = T.TakeWhile(a => a.S == T[0].S).ToArray();

                var cnt = T.Count();
                d += cnt;

                //Console.WriteLine(T.Count()+" "+T[0].S);

                if(d >= K)
                {
                    cnt -= d - K;
                    flag = true;
                }
                 
                for (int j = 0; j < cnt; j++)
                {
                    T = T.OrderBy(a => C[a.U]).ThenBy(a => a.P).ToArray();
                    sb.AppendLine(T[0].Num.ToString());
                    C[T[0].U]++;
                    T = T.Skip(1).ToArray();                                  
                }
                if (flag)
                {
                    Console.Write(sb);
                    return;
                }

            }

            
        }
        class University
        {
            internal int Num, S, P, U;
            public University(int Num, int S, int P, int U)
            {
                this.Num = Num;
                this.S = S;
                this.P = P;
                this.U = U;
            }
        }


        static int[] scan { get { return Array.ConvertAll(Console.ReadLine().Split(), int.Parse); } }
    }
}