#618. Second smallest value
You are given a list of integers. **Second smallest value**. If there is no second value, print `None`. If the answer has several numbers, separate them with spaces.
### Input
The first line has n, the second line has n integers separated by spaces.
### Output
The answer.
Examples
Input
3 -15 19 7
Output
7
Input
11 -11 20 10 6 -4 -13 12 18 -9 -4 4
Output
-11
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.