#include <bits/stdc++.h>

using namespace std;
int minimumNumber(int n, char password[]) {
    // Return the minimum number of characters to make the password strong
    int s,u,l,d;
    s=u=l=d=1;

    string x = "!@#$%^&*()-+";

    int i,j;

    for(i=0; i<n; ++i)
        for(j=0; j<12; ++j)
            if(password[i] == x[j])
            {
                s=0;
                break;
            }

    for(i=0; i<n; ++i)
    {
        if(isdigit(password[i]))    d=0;
        if(islower(password[i]))    l=0;
        if(isupper(password[i]))    u=0;
    }

    int ans = s+u+l+d;

    if((ans+n) < 6)
        ans = 6 - n;

    return ans;
}

int main() {
    int n;
    cin >> n;
    cin.ignore();

    char password[100];
    gets(password);

    int answer = minimumNumber(n, password);
    cout << answer << endl;

    return 0;
}