#include<iostream>
#include<string>
#include<cmath>
#include<algorithm>
#include<vector>


using namespace std;


#define Alaa ios_base::sync_with_stdio(false);cin.tie(0);
#define ll long long
#define r 1000000007;
bool check_vow(char d){

		if(d=='a'||d=='e'||d=='i'||d=='o'||d=='u'||d=='y'){
			return true;

	}
	return false;
}

int main()
{
    Alaa;
  int n; cin>>n; string s; cin>>s; int cnt=0;
  int cntv=0, cntc=0;
  for(int i=0;i<s.length();i++){
  	if(check_vow(s[i])){
  		cntv++;
	  }
	  else if(!check_vow(s[i])){
	  cntc++;
	  }
  
  if(cntv>=1&&cntc>=1){
  	cnt++;
  cntv=0; cntc=0;
  	
  }}
  cout<<cnt;
    
    return 0;
}