#include <stdio.h>
#include <string.h>
int cv(char *str){
    int count=0;
    for(int i=0;str[i] != '\\0';i++){
        char ch=str[i];
        if(ch>='A' && ch<= 'Z'){
            ch = ch+32;
        }
        if(ch=='a'|| ch=='e'|| ch=='i'|| ch=='o'|| ch=='u'){
            count++;
        }
    }
    if(count==0){
        return -1;
    }
    else{
        return count;
    }
}
int main(){
    char ipstr[1000];
    fgets(ipstr,sizeof(ipstr),stdin);
    ipstr[strcspn(ipstr, "\\n")]=0;
    int result=cv(ipstr);
    printf("%d\\n",result);
    return 0;
}