#### Integer Equal to It's Index

You are given an array of non-negative integers as an argument. Return the first element found in the array whose index is equal to its value.

### Requirements

- Must return a single integer
- If there are multiple integers found must return only the first occurrence.

#### Example #1

```
solve([10, 20, 11, 12, 4])
> 4
```

*We return 4 since it is also at index 4 of the array*

#### Example #2

```
solve([2, 1, 11, 12, 4])
> 1
```

*Both 1 and 4's values match their indexes in the array. We return 1 since it is the first occurrence.*