#include<stdio.h>
int main(){
    int count=0;
    char str[50];
    scanf("%[^\n]s",str);
    
    while(str=="a","e","i","o","u"||"A","E","I","O","U"){
        count++;
        if(count>0){
        printf("%d",count);
        }
    else{
        printf("-1");
    }
    }
    return 0;
}