#include <bits/stdc++.h>

using namespace std;
    string numbers = "0123456789",
lower_case = "abcdefghijklmnopqrstuvwxyz",
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
special_characters = "!@#$%^&*()-+";
int minimumNumber(int n, string s) {
    int nu=1,l=1,u=1,sp=1,i,j,ans;
    for(i=0;i<n;i++)
    {
        if(s[i]>='a'&&s[i]<='z')
            l=0;
        else if(s[i]>='A'&&s[i]<='Z')
            u=0;
        else if(s[i]>='0'&&s[i]<='9')
            nu=0;
        else
        {
            for(j=0;special_characters[j]!='\0';j++)
            {
                if(special_characters[j]==s[i])
                    sp=0;
            }
        }
    }
    int k=s.length();
    ans=nu+l+u+sp;
    k+=ans;
    if(k<6)
        ans+=6-k;
    return ans;
    // Return the minimum number of characters to make the password strong
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}