#include <bits/stdc++.h>
using namespace std;
const long long mod = 998244353;
int main() {
  ios_base::sync_with_stdio(0);
  long long n;
  cin >> n;
  if (n & 1) {
    cout << -1;
  } else {
    int res[n][n][n];
    for (long long i = 0; i < n; i++) {
      for (long long j = 0; j < n; j += 2) {
        for (long long z = 0; z < n; z += 2) {
          res[i][j][z] = res[i][j + 1][z] = res[i][j + 1][z + 1] =
              res[i][j][z + 1] = (j / 2 + z / 2 + i) % 2;
        }
      }
    }
    for (long long i = 0; i < n; i++) {
      for (long long j = 0; j < n; j++) {
        for (long long z = 0; z < n; z++) {
          if (res[i][j][z])
            cout << "b";
          else
            cout << "w";
        }
        cout << endl;
      }
      cout << endl;
    }
  }
}
