#664. Values that appear only once
Print the values that appear exactly once, in increasing order. If there are none, print `None`.
### Input
The first line has n, the second line has n integers separated by spaces.
### Output
One line.
Examples
Input
9 3 0 5 8 2 5 1 3 5
Output
0 1 2 8
Input
10 5 3 3 6 6 6 6 0 3 1
Output
0 1 5
💡 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.