Java accept sentence from user and print all word starts with vowel and end with consonant

import java.util.*;
class StringExample6 
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter string:");
        String str=input.nextLine();
        StringTokenizer stk=new StringTokenizer(str);
        String vowels="",consonants="";
        while(stk.hasMoreTokens()){
            String token=stk.nextToken();
            if(token.startsWith("a")||token.startsWith("e")||token.startsWith("i")||token.startsWith("o")||token.startsWith("u")){
            vowels+=token+" ";
            }
            else if(!token.startsWith("a")||!token.startsWith("e")||!token.startsWith("i")||!token.startsWith("o")||!token.startsWith("u")){
            consonants+=token+" ";
            }
        }
        System.out.println("Second Output: "+vowels.concat(consonants));
    }
}