#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  int pc = 0;
  int nc = 0;
  int zc = 0;
  cin >> n;
  int* arr = new int[n];
  int* posarr;
  int* negarr;
  int* zeroarr;
  for (int i = 0; i < n; i++) {
    cin >> arr[i];
    if (arr[i] > 0) {
      pc++;
    } else if (arr[i] < 0) {
      nc++;
    } else {
      zc++;
    }
  }
  posarr = new int[pc];
  negarr = new int[nc];
  zeroarr = new int[zc];
  pc = nc = zc = 0;
  for (int i = 0; i < n; i++) {
    if (arr[i] > 0) {
      posarr[pc] = arr[i];
      pc++;
    } else if (arr[i] < 0) {
      negarr[nc] = arr[i];
      nc++;
    } else {
      zeroarr[zc] = arr[i];
      zc++;
    }
  }
  if (pc != 0 && zc != 0 && nc != 0) {
    if (nc % 2 == 0) {
      zeroarr[zc] = negarr[nc - 1];
      zc++;
      nc--;
    }
  } else {
    if (nc % 2 == 0) {
      zeroarr[zc] = negarr[nc - 1];
      zc++;
      nc--;
    }
    if (pc == 0) {
      posarr[pc] = negarr[nc - 1];
      posarr[pc + 1] = negarr[nc - 2];
      pc += 2;
      nc -= 2;
    }
  }
  cout << nc << " ";
  for (int i = 0; i < nc; i++) {
    cout << negarr[i] << " ";
  }
  cout << endl;
  cout << pc << " ";
  for (int i = 0; i < pc; i++) {
    cout << posarr[i] << " ";
  }
  cout << endl;
  cout << zc << " ";
  for (int i = 0; i < zc; i++) {
    cout << zeroarr[i] << " ";
  }
  cout << endl;
  return 0;
}
