I have a new list which contains

```
102
103
105
108

```

And an existing list which contains 

```
102
104
105
108
109

```

want to make a list of all the items present on new list and and delete the items from old list that are not present in the new list.

Basically I need a list 1 which contains, 

```
102
103
105
108

```

And another list which I need to delete from existing contains:

```
104
109

```