#include <algorithm>
#include <iostream>
using namespace std;

int main() {
  int n;
  cin >> n;
  int flower_array[n];
  for (int i = 0; i < n; i++) {
    cin >> flower_array[i];
  }
  for (int i = 0; i < n - 1; i++) {
    for (int j = 0; j < n - i - 1; j++) {
      int k = j + i;
      for (int l = 1; l <= k; l++) {
        cout << flower_array[l] << " ";
      }
      cout << endl;
    }
  }
  return 0;
}