#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 digit=0;
    int lcase=0;
    int ucase=0;
    int spchar=0;
    int i=0;
    while(password[i]!='\0')
    {
        if(48<=password[i] && password[i]<=57)
            digit++;
        if(65<=password[i] && password[i]<=90)
            ucase++;
        if(97<=password[i] && password[i]<=122)
            lcase++;
        if(password[i]==33)
            spchar++;
        if(password[i]==35)
            spchar++;
        if(password[i]==36)
            spchar++;
        if(password[i]==64)
            spchar++;
        if(password[i]==37)
            spchar++;
        if(password[i]==94)
            spchar++;
        if(password[i]==38)
            spchar++;
        if(password[i]==40)
            spchar++;
        if(password[i]==41)
            spchar++;
        if(password[i]==43)
            spchar++;
        if(password[i]==45)
            spchar++;
        i++;
    }
    int ans=0;
    if(ucase==0)
        ans++;
    if(lcase==0)
        ans++;
    if(spchar==0)
        ans++;
    if(digit==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;
}