#include<stdio.h>
#include<ctype.h>
int main(){
    char str[1000];
    int count=0;
    scanf("%[^\n]s",str);
    for(int i=0;str[i] != '\0';i++{
        char ch = tolower(str[i]);
        if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u'){
            count++;
        }
    }
    if(count > 0)
        printf("%d\n",count);
    else
        printf("-1\n");
    return 0;
}