var pocet = parseInt(document.getElementById("pocet").innerHTML);
var pismeno = parseInt(document.getElementById("pismeno").innerHTML);

switch (event.which) {
  case " ".charCodeAt(0):
  case ".".charCodeAt(0):
  case ",".charCodeAt(0):
  case "!".charCodeAt(0):
  case "?".charCodeAt(0):
    if (pismeno == 0) {
      document.getElementById("pocet").innerHTML = "0";
    }
    document.getElementById("pismeno").innerHTML = "1";                 
  break;
  default:
    pocet++;    
    document.getElementById("pocet").innerHTML = pocet.toString();
    document.getElementById("pismeno").innerHTML = "0";              
}