#818. Common words of two sentences
Print the words that are in both sentences, in alphabetical order. If there are none, print `None`.
### Input
Two lines.
### Output
One line.
Examples
Input
apple banana planet python computer keyboard python teacher school python
Output
python
Input
teacher level keyboard rocket apple planet planet school school python
Output
None
💡 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.