#include<bits/stdc++.h>
using namespace std;

#define fori(x,n) for(int x = 0; x < n; ++x)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define clr(x) memset(x, 0, sizeof(x))
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
typedef long long int ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpii;

const ll N = 1e5+5, MOD = 1e9+7;


string aa="!@#$%^&*()-+";
int main()
{
	//freopen("in.txt","r",stdin);freopen("out.txt","w",stdout);
    ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    int n;
    cin >> n;
    string s;
    cin >> s;
    int e=1,d=1,f=1,g=1;
    // for(int i=0;i<4;i++){
    	for(int i=0;i<n;i++){
    		// cout << i << " ";
    		if(s[i]>='0' && s[i]<='9')
    			e=0;
    		else if(s[i]>='a' && s[i]<='z')
    			d=0;
    		else if(s[i]>='A' && s[i]<='Z')
    			f=0;
    		else{
    			for(int j=0;j<sz(aa);j++){
    				if(aa[j]==s[i])
    					g=0;
    			}
    		}
    		// }if(s[i]=='!' || s[i]=='@' || s[i]=='#' || s[i]=='$' || s[i]=='%' || s[i]=='^' || s[i]=='&' || s[i]=='*'|| s[i]=='(' || s[i]==')' || s[i]=='+' s[i]=='-')
    			// g=0;
    	}
    // }
    int ans=e+d+f+g;
    if(sz(s)+ans < 6)
    	ans+=(6-n-ans);
    cout << ans;

    return 0;
}