#include <bits/stdc++.h>
#define fi first
#define se second
using namespace std;

map < char,bool > mp;

int main() {

    ios_base::sync_with_stdio(false);
	mp['+']=1;
	mp['-']=1;
	mp[')']=1;
	mp['(']=1;
	mp['*']=1;
	mp['&']=1;
	mp['^']=1;
	mp['%']=1;
	mp['$']=1;
	mp['#']=1;
	mp['@']=1;
	mp['!']=1;
    int n;
    cin >> n;
    string s;
    cin >> s;
    bool ind1,ind2,ind3,ind4;
    ind1=ind2=ind3=ind4=0;
	for (int i=0; i<n; i++) {
		if (s[i]<='Z' && s[i]>='A')
			ind1++;
		if (s[i]<='z' && s[i]>='a')
			ind2++;
		if (s[i]>='0' && s[i]<='9')
			ind3++;
		if (mp[s[i]])
			ind4++;
	}
    
    int ans=0;
    
	if (!ind1) {
		ans++;
		n++;
	}
	if (!ind2) {
		ans++;
		n++;	
	}
	if (!ind3) {
		ans++;
		n++;	
	}
	if (!ind4) {	
		ans++;
		n++;	
	}
	
	if (n<6)
		ans=ans+6-n;
		
	cout << ans;
	
    return 0;
}