String print(char poly){
        String s1=new String(),output=new String();
        sLinkedList target;
        if(poly=='R'){target=R;}
        else{target=identify(poly);}
        if(target==null){throw new IllegalArgumentException("polonominal is empty ");}
        else{int[]temp;
            for(int i=0;i<target.size();i++){
             temp=(int[])target.get(i);
             s1=" "+temp[0]+" X^"+temp[1];
             output=output+s1;
            }
        }
        return output;
    }