#547. Words starting with 'b'
You are given some words. Print the words that start with the letter `b`, in their order, separated by spaces. If there are none, print `None`.
### Input
One line.
### Output
One line.
Examples
Input
loop window music dragon apple stats game mouse
Output
None
Input
teacher dragon computer winter loop string robot number dragon
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.