#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    int i,j;
    bool num=0;
    for(i=0;i<n;i++)
    {
        if(password[i]>='0' && password[i]<='9')
        {
            num=1;
            break;
        }
    }
    bool small=0;
    for(i=0;i<n;i++)
    {
        if(password[i]>='a' && password[i]<='z')
        {
            small=1;
            break;
        }
    }
    bool large=0;
    for(i=0;i<n;i++)
    {
        if(password[i]>='A' && password[i]<='Z')
        {
            large=1;
            break;
        }
    }
    bool spcl=0;
    string sp="!@#$%^&*()-+";
    for(i=0;i<n;i++)
    {
        for(j=0;j<sp.length();j++)
        {
            
        
        if(password[i]==sp[j])
        {
            spcl=1;
            break;
        }
        }
    }
    int ans=0;
    if(num==0)
        ans++;
    if(small==0)
        ans++;
    if(large==0)
        ans++;
    if(spcl==0)
        ans++;
    
    if(n+ans<6)
    {
        ans+=6-n-ans;
    }
    return ans;
}

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