#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string p) {
    // Return the minimum number of characters to make the password strong
    int b=1,c=1,d=1,e=1,a=0;
    string ss="!@#$%^&*()-+";
    for(int i=0;i<p.size();i++)
    {
        if(p[i]>='0' && p[i]<='9') b=0;
        else if(p[i]>='a' &&  p[i]<='z') c=0;
        else if(p[i]>='A' &&  p[i]<='Z') d=0;
        else
        {
            for(int j=0;j<ss.size();j++) if(p[i]==ss[j]) e=0;
        }
    }
    if(p.size()+b+c+d+e<6) a+=6-(p.size()+b+c+d+e);
    return a+b+c+d+e;
    
}

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