#include <iostream>
#include <string>

using namespace std;

string s;
int n;
int ans=0, add=0;

void Check()
{
	for (int i=0;i<n;i++)
		if (s[i]>=65 && s[i]<=90) 
		{
			ans++; 
			break;
		}
	for (int i=0;i<n;i++)
		if (s[i]>=48 && s[i]<=57) 
		{
			ans++; 
			break;
		}
	for (int i=0;i<n;i++)
		if (s[i]=='!' || s[i]=='#' || s[i]=='@' || s[i]=='$' || s[i]=='%' 
			|| s[i]=='^' || s[i]=='&' || s[i]=='*' || s[i]=='(' || s[i]==')'
			|| s[i]=='+' || s[i]=='-') 
		{
			ans++; 
			break;
		}
	for (int i=0;i<n;i++)
		if (s[i]>=97 && s[i]<=122) 
		{
			ans++; 
			break;
		}
	ans=4-ans;
	if (n+ans<=6) ans+=6-(n+ans);
}

int main()
{
	cin>>n;
	cin>>s;
	Check();
	cout<<ans;
	return 0;
}