#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
  int n, m, k;
  cin >> n >> m >> k;
  vector<vector<int>> a(n, vector<int> (n));
  vector<int> cnt(m + 1, n * n / m);
  cnt[0] = 0;
  int num = 0;
  for (int i = k - 1; i >= 0; --i)
  {
    for (int j = 0; j <= i; ++j)
    {
      ++num;
      if (num > m) break;
      for (int bx = i; bx < n; bx += k)
      {
        for (int by = j; by < n; by += k)
        {
          a[bx][by] = num;
          --cnt[num];
        }
      }
      ++num;
      if (num > m) break;
      if (j < i)
      {
        for (int bx = j; bx < n; bx += k)
        {
          for (int by = i; by < n; by += k)
          {
            a[bx][by] = num;
            --cnt[num];
          }
        }
      }
    }
  }
  vector<int> nok;
  for (int i = 1; i <= m; ++i)
  {
    if (cnt[i] < 0)
    {
      cout << -1 << endl;
      return 0;
    }
    while (cnt[i] > 0)
    {
      --cnt[i];
      nok.push_back(i);
    }
  }
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < n; ++j)
    {
      if (a[i][j] == 0)
      {
        a[i][j] = nok.back();
        nok.pop_back();
      }
    }
  }
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < n; ++j)
    {
      cout << a[i][j] << " \n"[j == n - 1];
    }
  }
}