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

public class Solution {

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    String s = scanner.nextLine().trim();
    if (s.isEmpty()) {
        System.out.println(0);
        return;
    }
    String[] words = s.split("[^A-Za-z]+");
    System.out.println(words.length);
    for (String w : words) System.out.println(w);
}

}

Solved

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    String s = scan.nextLine();
    // Write your code here.
    String[] arrayTemp = s.split("[ !,?._'@]+");
    StringBuffer strResult = new StringBuffer();
    int count = 0;
    for(int i = 0; i < arrayTemp.length; i++){
        if(arrayTemp[i].matches("[A-Za-z]+")){
            count++;
            strResult.append(arrayTemp[i]+"\n");
        }
    }
    System.out.println(count+"\n"+strResult);    

    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 st = s.trim();
    if(st.length() == 0)
     System.out.println("0");
    else {
    String[] result = st.split("[ !,?._'@]+");
    System.out.println(result.length);
    for(String str : result)
     System.out.println(str);
    }
    scan.close();
}

}

Hello !!

I'm realy close to solve that problem but test no 9, he didn't give up. i fail that test, the single one. could you help me with an hint? My solution is this:

        Scanner scan = new Scanner(System.in);
    String s = scan.nextLine().trim();
    String[] tokens = s.split("[ !,?._'@]+");
    System.out.println(tokens.length);
    for (int i = 0; i < tokens.length; ++i) {
        System.out.println(tokens[i]);
    }
    scan.close();

well i tried my best unable to pass few test cases. Anyone could help me out??

  public static void myStringTokenizer(String a){
    
        
        
        if(1<=a.length() && a.length() <=(4*100000)){
          //regex
            String regex = "[!,?._@]+";
            String str = a.replaceAll(regex, "");
            str = str.replaceAll("['    ]+", " ");
            String[] s = str.split(" ");
            // System.out.println(Arrays.toString(s));
            System.out.println(s.length);
            for(String temp: s){
                System.out.println(temp);
            }  
        }
        
    }