// Matrice bordată
// Moare pe la nivelul 260.000
#include <assert.h>
#include <stdio.h>

#define MAX_N 5000

char a[MAX_N + 2][MAX_N + 2];
int m, n;
int maxLevel;

void fill(int l, int c, int level) {
  if (a[l][c] == '.') {
    a[l][c] = 'o'; // marchează punctul (l, c) ca vizitat
    if (level > maxLevel) {
      maxLevel = level;
      if (level % 100 == 0) {
        printf("level %d\n", level);
      }
    }
    fill(l - 1, c, level + 1);
    fill(l, c + 1, level + 1);
    fill(l + 1, c, level + 1);
    fill(l, c - 1, level + 1);
  }
}

int main(void) {
  int l0, c0;
  FILE *f = fopen("fill.in", "r");
  fscanf(f, "%d %d %d %d\n", &m, &n, &l0, &c0);
  for (int i = 1; i <= m; i++) {
    for (int j = 1; j <= n; j++) {
      a[i][j] = fgetc(f);
    }
    assert(fgetc(f) == '\n');
  }
  fclose(f);

  fill(l0, c0, 0);
  printf("Nivelul maxim: %d\n", maxLevel);

  f = fopen("fill.out", "w");
  for (int i = 1; i <= m; i++) {
    for (int j = 1; j <= n; j++) {
      fputc(a[i][j], f);
    }
    fputc('\n', f);
  }
  fclose(f);
}