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.