int program(int argc, string[] argv) {
  var x = array_of_string("");
  var y = string_of_array(x);
  var z = length_of_string(y);
  var a = string_of_int(3);
  var b = string_cat("hello", "world");
  print_string(b);
  print_int(3);
  print_bool(true);
  return z;
}