#include <bits/stdc++.h>
using namespace std;
inline void _() { ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0); }
void __() {}
inline void ___(char *i, char *j) {
  freopen(i, "r", stdin);
  freopen(j, "w", stdout);
}
template <class T1>
bool tk(T1 &e1) {
  if (cin >> e1) return true;
  return false;
}
template <class T1, class T2>
bool tk(T1 &e1, T2 &e2) {
  if (cin >> e1 >> e2) return true;
  return false;
}
template <class T1, class T2, class T3>
bool tk(T1 &e1, T2 &e2, T3 &e3) {
  if (cin >> e1 >> e2 >> e3) return true;
  return false;
}
template <class T1, class T2, class T3, class T4>
bool tk(T1 &e1, T2 &e2, T3 &e3, T4 &e4) {
  if (cin >> e1 >> e2 >> e3 >> e4) return true;
  return false;
}
template <class T1, class T2, class T3, class T4, class T5>
bool tk(T1 &e1, T2 &e2, T3 &e3, T4 &e4, T5 &e5) {
  if (cin >> e1 >> e2 >> e3 >> e4 >> e5) return true;
  return false;
}
template <class T1, class T2, class T3, class T4, class T5, class T6>
bool tk(T1 &e1, T2 &e2, T3 &e3, T4 &e4, T5 &e5, T6 &e6) {
  if (cin >> e1 >> e2 >> e3 >> e4 >> e5 >> e6) return true;
  return false;
}
template <class T1>
void put(T1 e) {
  cout << e << endl;
}
template <class T1, class T2>
void put(T1 e1, T2 e2) {
  cout << e1 << " " << e2 << endl;
}
template <class T1, class T2, class T3>
void put(T1 e1, T2 e2, T3 e3) {
  cout << e1 << " " << e2 << " " << e3 << endl;
}
template <class T1, class T2, class T3, class T4>
void put(T1 e1, T2 e2, T3 e3, T4 e4) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << endl;
}
template <class T1, class T2, class T3, class T4, class T5>
void put(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << " " << e5 << endl;
}
template <class T1, class T2, class T3, class T4, class T5, class T6>
void put(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5, T6 e6) {
  cout << e1 << " " << e2 << " " << e3 << " " << e4 << " " << e5 << " " << e6
       << endl;
}
template <class T1>
void putVec(vector<T1> e1) {
  for (int i = 0; i < (e1).size(); i++)
    (!i ? cout << e1[i] : cout << " " << e1[i]);
  cout << endl;
}
template <class T1>
void putArr(T1 arr[], int l) {
  for (int i = 0; i < l; i++) (!i ? cout << arr[i] : cout << " " << arr[i]);
  cout << endl;
}
template <class T1>
void bug(T1 e) {}
template <class T1, class T2>
void bug(T1 e1, T2 e2) {}
template <class T1, class T2, class T3>
void bug(T1 e1, T2 e2, T3 e3) {}
template <class T1, class T2, class T3, class T4>
void bug(T1 e1, T2 e2, T3 e3, T4 e4) {}
template <class T1, class T2, class T3, class T4, class T5>
void bug(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5) {}
template <class T1, class T2, class T3, class T4, class T5, class T6>
void bug(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5, T6 e6) {}
template <class T1>
void bugVec(vector<T1> e1) {}
template <class T1>
void bugArr(T1 arr[], int l) {}
template <typename T>
inline bool isOn(T &mask, int pos) {
  return ((mask) & (1 << pos));
}
template <typename T>
inline void setOff(T &mask, int pos) {
  mask = ((mask) & (~(1 << pos)));
}
template <typename T>
inline void setOn(T &mask, int pos) {
  mask = ((mask)(1 << pos));
}
namespace gv {};
long long absolute(long long a) {
  if (a < 0) return -a;
  return a;
}
string s[505];
int v[505][505], n, m, k, t;
int dx[] = {0, 0, -1, 1};
int dy[] = {-1, 1, 0, 0};
int depth;
void dfs(int x, int y) {
  if (x < 0 || y < 0 || x >= n || y >= m || s[x][y] == '#' || s[x][y] == 'X' ||
      v[x][y])
    return;
  depth++;
  v[x][y] = 1;
  if (depth > (t - k)) v[x][y] = 2;
  for (int i = 0; i < 4; i++) {
    dfs(x + dx[i], y + dy[i]);
  }
}
int main() {
  _();
  int sx, sy;
  tk(n, m, k);
  for (int i = 0; i < n; i++) {
    tk(s[i]);
    for (int j = 0; j < m; j++) {
      if (s[i][j] == '.') t++, sx = i, sy = j;
    }
  }
  dfs(sx, sy);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      if (v[i][j] == 2)
        cout << 'X';
      else
        cout << s[i][j];
    }
    put("");
  }
  __();
}
