NSU Usrat Rifat

import java.util.*;

class Main {

    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);
        String str = s.nextLine();

        System.out.println( countVowels(str) );
    }

    public static int countVowels(String str){
        int counter = 0;

        for (int i=0 ; i< str.length(); i++){
            str = str.toLowerCase();
            char ch = str.charAt(i);
            if( ch == 'a'|| ch == 'e'|| ch == 'i' ||ch == 'o' ||ch == 'u'){
                counter++;
            }
        }

        return counter;
    }
}