import java.util.*;
public class main
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        String ch=scan.nextLine();
        char ch1[]=ch.toCharArray();
        int count=0;
        for(int i=0;i<ch1.length;i++)
        {
            if(ch1[i]=='a'||ch1[i]=='A'||ch1[i]=='E'||ch1[i]=='e'||ch1[i]=='i'||ch1[i]=='I'||ch1[i]=='o'||ch1[i]=='O'||ch1[i]=='u'||ch1[i]=='U')
            {
                count++;
            }
            else
            {
                return -1;
            }
        }
        System.out.println(count);
    }
}