#645. Union (different values)
You are given two lists. Print the **Union (different values)** in increasing order. If it is empty, print `None`.
### Input
The first two lines have n and the list a, the next two lines have m and the list b.
### Output
One line.
Examples
Input
5 6 2 15 3 4 3 12 9 1
Output
1 2 3 4 6 9 12 15
Input
2 14 14 3 0 13 9
Output
0 9 13 14
💡 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.