#include <iostream>
using namespace std;
int main(){
int n;
char curent;
int vocale=0;
cin >> n;
for(int i=0;i<n;i++){
cin >> curent;
if(curent>='A' && curent <='Z') curent = curent -'A'+'a';
if(curent == 'a' || curent == 'e' || curent == 'i' || curent == 'o' || curent == 'u') vocale++;
}
cout << vocale;
}