#include<stdio.h>
int main()
{
    int i,count=0;
    char str[1000];

    scanf("%[^\n]s",str);
    for(i=0;str[i]!='\0';i++){
    if(str[i] =='a'||str[i]=='e'||str[i]=='i'||str[i]=='o'||str[i]=='u'||str[i]=='A'||str[i]='E'||str[i]='I'||str[i]=='O'||str[i]=='U'){
        count++;
    }
    }
    if(count>0){
    printf("%d",count);
    }
    else{
    printf("-1");
    }
    }
    return 0;
}