public static ArrayList<String> produce_RPN(ArrayList<String> list_temp)
    {
        int t=0,i=0;
        String tmp;
        Tack mytack = new Tack(20);
        ArrayList<String> lt_temp = new ArrayList<String>();
        while(true)
        {
            tmp = list_temp.get(i++);
            if(isInteger(tmp))
            {
                lt_temp.add(tmp);
            }
            else{
                if(mytack.myisempty())
                {
                    mytack.mypush(tmp);
                }
                    
                
                else{
                    if(isCPriority(tmp, mytack.mypeek()))
                        mytack.mypush(tmp);
                    else{
                        lt_temp.add(mytack.mypop());
                        mytack.mypush(tmp);
                    }
                    
                }
            }
            if(i>=list_temp.size())
            {
                while(!mytack.myisempty())
                    lt_temp.add(mytack.mypop());
                System.out.println(transform_string(list_temp));
                list_temp = lt_temp;
                System.out.println(list_temp);
                return list_temp;
            }
        }
}