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