Check target in spell

[OperatorMopa]

Do you know how to check if target it player or monster in spells ?
For example i wanna sudden death rune print what creature does it shot (player/monster)

 

[Mkalo]

function onCastSpell(creature, var, isHotkey)
   local target = Creature(var.number)
   if target then
     print(target:isMonster() and "monster" or (target:isPlayer() and "player" or "nil"))
   end
   return combat:execute(creature, var)
end

Edit: ops

 

[OperatorMopa]

Thanks !
var.number is what i need