#include <bits/stdc++.h>
using namespace std;
const long long N = 100 + 9;
long long n;
long long ans[N][N];
void rot() {
  long long res[N][N] = {};
  for (int i = 0; i < (n); i++)
    for (int j = 0; j < (n); j++) res[j][n - i - 1] = ans[i][j];
  for (int i = 0; i < (n); i++)
    for (int j = 0; j < (n); j++) ans[i][j] = res[i][j];
}
void color() {
  for (long long i = 0; i < n / 2; i += 2)
    for (long long j = i; j < n - i; j++) ans[i][j] = 1;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  if (n & 1) {
    cout << -1;
    return 0;
  }
  for (int i = 0; i < (4); i++) {
    color();
    rot();
  }
  for (int e = 0; e < (n); e++) {
    for (int i = 0; i < (n); i++) {
      for (int j = 0; j < (n); j++)
        if (e & 1)
          cout << (ans[i][j] ? "b" : "w");
        else
          cout << (ans[i][j] ? "w" : "b");
      cout << endl;
    }
    cout << endl;
  }
}
