// Matrice bordată și variabile globale
// Moare pe la nivelul 520.000
#include <assert.h>
#include <stdio.h>

#define MAX_N 5000

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

void fill() {
  if (a[l][c] != '.') {
    return;
  }
  a[l][c] = 'o';
  level++;
  if (level > maxLevel) {
    maxLevel = level;
    if (level % 100 == 0) {
      printf("level %d\n", level);
    }
  }
  l--;
  fill();
  l++;
  c++;
  fill();
  c--;
  l++;
  fill();
  l--;
  c--;
  fill();
  c++;
}

int main(void) {
  FILE *f = fopen("fill.in", "r");
  fscanf(f, "%d %d %d %d\n", &m, &n, &l, &c);
  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);

  level = 0;
  fill();
  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);
}