#include <bits/stdc++.h>
using namespace std;

#define _p(...) (void)printf(__VA_ARGS__)
#define forr(x,arr) for(auto&& x:arr)
#define _overload3(_1,_2,_3,name,...) name
#define _rep2(i,n) _rep3(i,0,n)
#define _rep3(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload3(__VA_ARGS__,_rep3,_rep2,)(__VA_ARGS__)
#define _rrep2(i,n) _rrep3(i,0,n)
#define _rrep3(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define rrep(...) _overload3(__VA_ARGS__,_rrep3,_rrep2,)(__VA_ARGS__)
#define ALL(x) (x).begin(), (x).end()
#define BIT(n) (1LL<<(n))
#define SZ(x) ((int)(x).size())
#define fst first
#define snd second
using ll=long long;using pii=pair<int,int>;using vb=vector<bool>;
using vi=vector<int>;using vvi=vector<vi>;using vvvi=vector<vvi>;
using vl=vector<ll>;using vvl=vector<vl>;using vvvl=vector<vvl>;
using vd=vector<double>;using vvd=vector<vd>;using vvvd=vector<vvd>;
using vpii=vector<pii>;using vvpii=vector<vpii>;using vvvpii=vector<vvpii>;
template <typename T> T read() {T t; cin >> t; return t;}

using iii = pair<int, pii>;

void Main() {
  int N = read<int>();
  int K = read<int>();

  map<int, map<int, vpii>> smap;
  map<int, int> uc;

  rep(i, N) {
    int s = read<int>();
    int p = read<int>();
    int u = read<int>();
    smap[-s][u].emplace_back(p, i);
  }

  vi ans;
  forr(st, smap) {
    map<int, vpii> &uteams = st.snd;
    vi us;
    forr(uts, uteams) {
      us.push_back(uts.fst);
      sort(ALL(uts.snd), greater<pii>());
    }

    sort(ALL(us));
    us.erase(unique(us.begin(), us.end()), us.end());

    priority_queue<iii, vector<iii>, greater<iii> > q;
    forr(u, us) q.push({uc[u], {uteams[u][SZ(uteams[u])-1].fst, u}});

    while (!q.empty() && K) {
      int u = q.top().snd.snd;
      q.pop();
      vpii &teams = uteams[u];

      int idx = teams[SZ(teams)-1].snd;
      ans.push_back(idx);
      teams.pop_back();
      uc[u]++;
      K--;
      if (SZ(teams)) {
        q.push({uc[u], {uteams[u][SZ(uteams[u])-1].fst, u}});
      }
    }
  }

  forr(i, ans) cout << i << endl;

}
int main() { cin.tie(nullptr); ios::sync_with_stdio(false); Main(); return 0; }