You are given an array $A$ contains unique integer of length $n$. Find the second largest value in $A$.
### Input
- The first line contains an integer $n$.
- The second line contains $n$ integers $A_i$.
### Output
- Print a single integer, the second largest value.
### Constraints
- $2 \le n \le 10^5$.
- $|A_i| \le 10^5 $.
### Example
Input:
```
4
4 3 2 1
```
Output:
```
3
```
