Java string Tokens

Given a string, , matching the regular expression [A-Za-z !,?._'@]+, 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.

Input Format

A single string, .

Constraints

•  is composed of any of the following: English alphabetic letters, blank spaces, exclamation points (!), commas (,), question marks (?), periods (.), underscores (_), apostrophes ('), and at symbols (@).

Output Format

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

Sample Input

He is a very very good boy, isn't he?

Sample Output

10

He

is

a

very

very

good

boy

isn

t

he

Explanation

We consider a token to be a contiguous segment of alphabetic characters. There are a total of  such tokens in string , and each token is printed in the same order in which it appears in string .

Program:

import java.io.*;

import java.util.*;

public class Solution {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        String input = scan.nextLine().trim();

        scan.close();

        

        String[] tokens = input.split("[^\\p{Alpha}]+");

        

        int size = (input.isEmpty()) ? 0 : tokens.length;

        System.out.println(size);

        

        for(String s : tokens) {

            System.out.println(s);

        }

    }

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