#593. Words starting with 'r'
You are given some words. Print the words that start with the letter `r`, in their order, separated by spaces. If there are none, print `None`.
### Input
One line.
### Output
One line.
Examples
Input
winter list planet apple kayak mouse keyboard mountain computer
Output
None
Input
level school refer planet school rocket apple mouse python rocket
Output
refer rocket rocket
💡 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.