#include <bits/stdc++.h>

using namespace std;

int main()
{
	int n,sp,l,u,num,count,i;
	string s;
	sp = l = u = num = 0;
	cin>>n;
	cin>>s;
	map<char,int> hm;
	string ss ="!@#$%^&*()-+";
	for(i=0;i<ss.size();i++)
		hm[ss[i]] = 1;
	for(i=0;i<n;i++)
	{	
		if(s[i]>='a' && s[i] <= 'z')
			l++;
		if(s[i]>='A' && s[i] <= 'Z')
			u++;
		if(s[i]>='0' && s[i] <= '9')
			num++;
		if(hm.find(s[i]) != hm.end())
			sp++;
	}
	count = 0;
	if(l == 0)
		count += 1;
	if(u == 0)
		count += 1;
	if(sp == 0)
		count += 1;
	if(num == 0)
		count += 1;
	if(s.size() + count <6)
		count = count + (6-(s.size() + count));
	cout<<count<<"\n";
	return 0;
}