#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int i, j, k;
  char b = 'b', w = 'w', p;
  if (n % 2) {
    cout << -1;
    return 0;
  }
  char ans[n + 1][n + 1];
  int s = 1, e = n;
  while (s < e) {
    if (s % 2)
      p = b;
    else
      p = w;
    for (i = s; i <= e; ++i) {
      ans[i][s] = p;
      ans[s][i] = p;
      ans[i][e] = p;
      ans[e][i] = p;
    }
    ++s;
    --e;
  }
  int inv;
  for (i = 1; i <= n; ++i) {
    if (i % 2 == 0)
      inv = 1;
    else
      inv = 0;
    for (j = 1; j <= n; ++j) {
      for (k = 1; k <= n; ++k) {
        if (inv)
          cout << (char)(b + w - ans[j][k]);
        else
          cout << (char)ans[j][k];
      }
      cout << "\n";
    }
    cout << "\n";
  }
  return 0;
}
