/* Bajo el volc n.
   Primera fase OIE 2000

   Compilado con DJGPP
*/

#include <stdio.h>

#define ENTRADA "VOLCAN.DAT"
#define SALIDA "VOLCAN.RES"

int volcan[102][102];

void lava(int f, int c);


int main(void)
{
  int f,c,  /* filas, columnas */
      x,y,  /* crater */
      i,j;
  FILE *entrada, *salida;

  entrada = fopen(ENTRADA, "r"); salida = fopen(SALIDA, "w");
  if (entrada == NULL || salida == NULL) {
     printf("\nError en los ficheros");
     exit(1);
  }

    /* lee datos */
  fscanf(entrada, "%d %d %d %d",&f,&c, &x, &y);
  for (i = 1; i <= f; i++)
    for (j = 1; j <= c; j++)
      fscanf(entrada, "%d", &volcan[i][j]);

    /* prepara el tablero */
  for (i = 0; i <= c+1; i++) volcan[0][i] = 'X';
  for (i = 0; i <= c+1; i++) volcan[f+1][i] = 'X';
  for (i = 0; i <= f+1; i++) volcan[i][0] = 'X';
  for (i = 0; i <= f+1; i++) volcan[i][c+1] = 'X';

    /* procesa recursivamente */
  lava(x,y);

    /* escribe la salida */
  for (i = 1; i <= f; i++) {
    for (j = 1; j <= c; j++) {
      if (volcan[i][j] == 'X') fprintf(salida,"X");
      else fprintf(salida, "%d", volcan[i][j]);
      if (j < c) fprintf(salida, " ");
    }
    fprintf(salida, "\n");
  }

  fclose(entrada);
  fclose(salida);

  return 0;
}

void lava(int f, int c)
{
  int nf, nc, aux;

  aux = volcan[f][c]; /* guarda la altura actual de la lava */
  volcan[f][c] = 'X'; /* marca terreno con lava */

  for (nf = f-1; nf <= f+1; nf++)
    for (nc = c-1; nc <= c+1; nc++)
      if (aux > volcan[nf][nc])
        lava(nf,nc);
}