#include <bits/stdc++.h>
using namespace std;
template <typename A, typename B>
string to_string(pair<A, B> p);
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);
string to_string(const string& s) { return '"' + s + '"'; }
string to_string(const char* s) { return to_string((string)s); }
string to_string(bool b) { return (b ? "true" : "false"); }
string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) res += ", ";
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}
template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) res += static_cast<char>('0' + v[i]);
  return res;
}
template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto& x : v) {
    if (!first) res += ", ";
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}
template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " +
         to_string(get<2>(p)) + ")";
}
template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " +
         to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << ' ' << to_string(H);
  debug_out(T...);
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  int n, m, k;
  cin >> n >> m >> k;
  vector<vector<char>> a(n, vector<char>(m));
  vector<vector<int>> mark(n, vector<int>(m));
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      cin >> a[i][j];
      if (a[i][j] == '#') {
        mark[i][j] = 1;
      }
    }
  }
  int cnt = 0;
  function<void(int, int)> Solve = [&](int i, int j) {
    if (mark[i][j]) {
      return;
    }
    mark[i][j] = 1;
    for (int x = max(0, i - 1); x <= min(n - 1, i + 1); ++x) {
      for (int y = max(0, j - 1); y <= min(m - 1, j + 1); ++y) {
        if (i == x || j == y) {
          ;
          Solve(x, y);
        }
      }
    }
    assert(cnt <= k);
    assert(a[i][j] == '.');
    if (cnt == k) {
      return;
    }
    a[i][j] = 'X';
    cnt++;
  };
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      Solve(i, j);
    }
  }
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      cout << a[i][j];
    }
    cout << '\n';
  }
  return 0;
}
