#include <bits/stdc++.h>

using namespace std;

struct Team
{
  int id, s, t;
  Team(int pid, int ps, int pt): id(pid), s(ps), t(pt) {}
};

bool less_result(const Team & a, const Team & b)
{
  return a.s > b.s || (a.s == b.s && a.t < b.t);
}

int main() {
  freopen("INPUT.TXT", "r", stdin);
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n, m, id, am, t; cin >> n >> m;
  vector< Team > data;
  for (int i = 0; i < n; ++i) {
    cin >> id >> am >> t;
    if (am > 0) data.push_back( Team(id, am, t) );
  }
  sort(data.begin(), data.end(), less_result);
  int mx_b = 13;
  int mn_b = 13;
  if ( data.size() > 0 )
  {
      mn_b = mx_b = data[0].s;
      if ( data.size() > 1 )
        mn_b = data[data.size() / 2 - 1].s;
  }

  set<int> contestants;
  for(int i = 0; i < (int)data.size() && (data[i].s > mn_b || data[i].s == mx_b); ++i)
  {
    contestants.insert( data[i].id );
  }

  for(int i=0; i<m; ++i)
  {
    cin >> id >> am >> t;
    if (am > 0) contestants.insert(id);
  }
  cout << contestants.size() << endl;
  for (auto y: contestants)
    cout << y << " ";
  return 0;
}