#include 
using namespace std;

typedef long long ll;
int main()
{
  int n;
  ll x;
  cin >> n >> x;

  pair niza[n];
  for(int i = 0; i < n; i++) {
      cin >> niza[i].first;
      niza[i].second = i;
  }
  sort(niza, niza + n);
  for(int i = 0; i < n; i++) {
    for(int j = i + 1; j < n; j++) {
      int L = j + 1, R = n - 1;
      while(L < R) {
        ll sum = niza[i].first + niza[j].first + niza[L].first + niza[R].first;
        if(sum == x) {
          cout << niza[i].second + 1 << " " << niza[j].second  +1 << " " << niza[L].second + 1 << " " << niza[R].second + 1 << endl;
          return 0;
        }
        if(sum < x) {
          L++;
        }
        else {
          R--;
        }
      }
    }
  }
  cout << "IMPOSSIBLE" << endl;

  return 0;
}