public static void main(String args[]){

Scanner input = new Scanner(System.in);

System.out.println("input a sentence");

String sentence = input.nextLine();

System.out.println(checkVovels(sentence));

}

public static String checkVovels(String a){

a.toLowerCase();

String vovelList = "";

for(int i = 0; i<a.length(); i++){

char letter = a.charAt(i);

if(letter==('a') || letter==('e')|| letter==('i')|| letter==('o')|| letter==('u') || letter==('A') || letter==('E')|| letter==('I')|| letter==('O')|| letter==('U')){

String L = Character.toString(letter);

vovelList=vovelList.concat(" ").concat(L);

}

}

return vovelList;

}

}