#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	string s;
	cin>>s;
	string numbers = "0123456789";
	string lower_case = "abcdefghijklmnopqrstuvwxyz";
	string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string special_characters = "!@#$%^&*()-+";
	bool num,l,u,sp;
	num = l = u = sp = false;
	int co = 0;
	for(int i=0;i<s.length();++i)
	{
		if(numbers.find(s[i])!=string::npos) num=true;
		else  if(lower_case.find(s[i])!=string::npos) l=true;
		else if(upper_case.find(s[i])!=string::npos) u=true;
		else if(special_characters.find(s[i])!=string::npos) sp=true;
	}
	if(!num) ++co;
	if(!l) ++co;
	if(!u) ++co;
	if(!sp) ++co;
	if(s.size()+co<6) co+=6-(s.size()+co);
	cout<<co<<endl;
	
}