import java.util.*;

public class Solution {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);

String s = scan.nextLine(); // s = s.trim();

// Split by commas, question marks, spaces, and apostrophes String[] s1 = s.split("[^a-zA-Z0-9]+");

int nonEmptyCount = 0; for (String word : s1) { if (!word.isEmpty()) { nonEmptyCount++; } }

// Print the word count first System.out.println(nonEmptyCount);

// Print each non-empty word for (String word : s1) { if (!word.isEmpty()) { System.out.println(word); } }

This Worked for me. scan.close();

} }

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    // Write your code here.


    String[] s1=s.split("[^a-zA-Z]+");
    System.out.println(s1.length);

    for(String x:s1){
        if (!x.isEmpty()) { // Avoid empty strings
            System.out.println(x);
        }
    }
    scan.close();
}

}

public class Solution {

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    String s = scanner.nextLine();
    StringTokenizer st = new StringTokenizer(s, " !,?._'@]+");
    int n = st.countTokens();
    System.out.println(n);
    while(st.hasMoreTokens()){
        System.out.println(st.nextToken());
    }
}

}

import java.io.; import java.util.; /* *@Author : Rehan *Using Stream API in Java8 */ public class SolutionDump {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    scan.close();
    if (s.trim().length()==0 || s.trim().length()>400000){
    System.out.println(0);
    return;
    }
    s=s.trim();
    // Write your code here.
    List<String> count = Stream
    .of(s.split("[^(a-zA-Z)]+")).collect(Collectors.toList());

    System.out.println(count.size());
            //to print the expected list
    \Stream.of(s.split("[^(a-zA-Z)]+")).forEach(System.out::println);

}

}

Why it needs to trim()?

If it doesn't trim() , it will not pass all the test even if they output the same thing

Why?

I would like to know

import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        scan.close();
        if (s.trim().length()==0 || s.trim().length()>400000){
        System.out.println(0);
        return;
        }
        s=s.trim();
        String regex = "[^(a-zA-Z)]+";
        String [] lista =s.split(regex);
        
       
        System.out.println(lista.length);
        
        
        for(String k:lista){
           System.out.println(k);
        }
        
        
        
    }
}