#564. Words with exactly 4 letters
You are given some words. Print the words that have exactly 4 letters, in their order, separated by spaces. If there are none, print `None`.
### Input
One line.
### Output
One line.
Examples
Input
school forest madam noon summer score flower flower variable
Output
noon
Input
list robot apple madam river winter winter
Output
list
💡 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.