One of my peculiar acquaintances introduced me to the world of puzzles, so I've started to dabble in making some of my own.

Here's a single sentence puzzle, where I want you to find a four letter word that is the answer to the puzzle, and a four letter word that is NOT the answer to the puzzle. You will be very sure when you have found either word.

```
I_ Y__ __AD TH_S RI___, _H_ A_SW_R ISN'T ___N THE A_SWER.

```

Oh, by the way... there's an L missing somewhere.

Hint for the Not Answer:

> 
>  **The numbers have two uses. One interpretation of the numbers will get you the answer. Another interpretation will give you the not answer!**
> 
> 
>