#include <bits/stdc++.h>
//for(int i=0;i<n;i++)
//for(int j=0;j<n;j++)
//cout<<<<"\n";
using namespace std;
int main()
{
	int n,l=0,s=0,num=0,up=0,lp=0,ans=0;
	string in,match="!@#$%^&*()-+";
	cin>>n;
	cin>>in;
	for(int j=0;j<n;j++)
	{
		if(in[j]>=65&&in[j]<=90)
			up++;
		else if(in[j]>=97&&in[j]<=122)
			lp++;
		else if(isdigit(in[j]))
			num++;
		else 
		{
			for(int i=0;i<12;i++)
			{
				if(in[j]==match[i])
				{
					s++;
					//cout<<"match\n";
					break;
				}
			}
		}
		l++;
	}
	//cout<<ans<<endl;
	if(num==0)
		ans++;
		//cout<<ans<<endl;
	if(up==0)
		ans++;
	//cout<<ans<<endl;
	
	if(lp==0)
		ans++;
		//cout<<ans<<endl;
	if(s==0)
		ans++;
	//cout<<ans<<endl;	
	if(ans+n<6)
		ans+=(6-(ans+n));
	cout<<ans<<endl;	
	return 0;
}