#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin>>n;
    char a[n+1];
    cin>>a;
    string b="!@#$%^&*()-+";
    int l=0,u=0,nu=0,s=0,i,c=0;
    for(i=0;i<n;i++)
    {
        if(a[i]>=65&&a[i]<=90)
            u++;
        else if(a[i]>=97&&a[i]<=122)
            l++;
        else if(a[i]>=48&&a[i]<=57)
            nu++;
        else
        {
            for(int j=0;j<13;j++)
                if(a[i]==b[j])
                {
                    s++;
                    break;
                }
        }
    }
    //cout<<u<<l<<nu<<s<<c;
    if(u==0)
        c++;
    if(l==0)
        c++;
    if(nu==0)
        c++;
    if(s==0)
        c++;
    if(n+c<6)
        c+=(6-n-c);
    cout<<c;
    return 0;
}