int read_word_from_file(FILE *f, char *w)
{
  char c, *ptr = w;

  while(fscanf(f, "%c", &c) == 1) {
    if((c >=65 && c <= 90) || (c >= 97 && c <= 122)) {
      *ptr = c;
      ptr++;
    } else {
      if(ptr == w) {
        continue;
      } else {
        break;
      }
    }
  }

  if(ptr == w) {
    *ptr = 0;
    return 0;
  }

  *ptr = 0;


  /* convert to lower case */

  for(ptr = w; *ptr; ptr++) {
    if(*ptr < 97) {
      *ptr += 32;
    }
  }

  return 1;
}