#include<stdio.h>
int main(){
    char s[100];
    int c=0;
    scanf("%s",s);
    for(int i=0 ; s[i]!='\0' ; i++){
        if(s[i]=='a' || s[i]=='e' || s[i]=='i' || s[i]=='o' || s[i]=='u' || s[i]=='A' || s[i]=='E' || s[i]=='I' || s[i]=='O' || s[i]='U'){
            c++;
        }
    }
    if(c>0){
        printf("%d",c);
    }
    else 
    printf("-1");
}