#include <bits/stdc++.h>
using namespace std;
int main(){
  int W, H, X;
  cin >> W >> H >> X;
  vector<vector<bool>> ok(3, vector<bool>(3, true));
  for (int i = 0; i < 3; i++){
    if (W % 3 == 0){
      ok[i][0] = false;
      ok[i][2] = false;
    }
    if (W % 3 == 1){
      ok[i][1] = false;
      ok[i][2] = false;
    }
    if (W % 3 == 2){
      ok[i][2] = false;
    }
  }
  for (int i = 0; i < 3; i++){
    if (H % 3 == 0){
      ok[0][i] = false;
      ok[2][i] = false;
    }
    if (H % 3 == 1){
      ok[1][i] = false;
      ok[2][i] = false;
    }
    if (H % 3 == 2){
      ok[2][i] = false;
    }
  }
  int cnt = 0;
  for (int i = 0; i < 3; i++){
    for (int j = 0; j < 3; j++){
      if (ok[i][j]){
        cnt++;
      }
    }
  }
  if (X > cnt * 9){
    cout << -1 << endl;
  } else {
    vector<vector<int>> a(3, vector<int>(3, 0));
    int curr = 0;
    for (int i = 0; i < 3; i++){
      for (int j = 0; j < 3; j++){
        if (ok[i][j]){
          a[i][j] = (X + curr) / cnt;
          curr++;
        }
      }
    }
    for (int i = 0; i < H; i++){
      for (int j = 0; j < W; j++){
        cout << a[i % 3][j % 3];
      }
      cout << endl;
    }
  }
}