Given a string, $s,$ matching the regular expression $!,?.\_\text{'}$ @$]+,$ split the string

into tokens. We define a token to be one or more consecutive English alphabetic

letters. Then, print the number of tokens, followed by each token on a new line.

Note: You may find the String.split method helpful in completing this challenge.

Input Format

A single string, $s.$

Constraints

$1$ length of $s4*{10}^5$

$s$ is composed of any of the following: English alphabetic letters, blank spaces,

exclamation points $(!),$ commas $(,),$ question marks $(?),$ periods $(.),$ underscores $(\_),$

apostrophes $(\text{'}),$ and at symbols $($@$).$

Output Format

On the first line, print an integer, $n,$ denoting the number of tokens in string $s($they do not need to be unique$).$ Next, print each of the $n$ tokens on a new line in the same order as they appear in input string $s.$