#546. Words with exactly 3 letters
You are given some words. Print the words that have exactly 3 letters, in their order, separated by spaces. If there are none, print `None`.
### Input
One line.
### Output
One line.
Examples
Input
scratch game score list keyboard mountain list
Output
None
Input
list madam music civic code code scratch apple
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.