#819. Symmetric difference
Print the words that are in only one of the two sentences, in alphabetical order. If there are none, print `None`.
### Input
Two lines.
### Output
One line.
Examples
Input
scratch level rocket scratch robot scratch banana banana
Output
banana level robot rocket
Input
robot apple scratch level scratch robot planet banana
Output
apple banana level planet
💡 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.