#include<string>
#include <iostream>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,i,req=0;
    bool no,lc,uc,sc;
    no = lc = uc = sc = false;
    string password,numbers = "0123456789",lower_case = "abcdefghijklmnopqrstuvwxyz",upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",special_characters = "!@#$%^&*()-+";
    cin>>n;
    cin>>password;
    for(i=0;i<n;i++)
    {
        if(no == false)
        {
            if(numbers.find(password[i]) != -1)
                no = true;
        }
        if(lc == false)
        {
            if(lower_case.find(password[i]) != -1)
                lc = true;
        }
        if(uc == false)
        {
            if(upper_case.find(password[i]) != -1)
                uc = true;
        }
        if(sc == false)
        {
            if(special_characters.find(password[i]) != -1)
                sc = true;
        }
        if(no && lc && uc && sc)
        {
            break;
        }
    }
    if(no == false)
        req += 1, n += 1;
    if(lc == false)
        req += 1, n += 1;
    if(uc == false)
        req += 1, n += 1;
    if(sc == false)
        req += 1, n += 1;
    //cout<<"n : "<<n<<endl;
    if(n < 6)
        req += (6-n);
    cout<<req;
    return 0;
}