#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

bool tas(char a, string b)
{
    for(char x: b)
        if(a==x)
            return true;
    return false;
}
int main() {
    int n;
    cin>>n;
    string x;
    cin>>x;
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    int ans=0;
    int num=1;
    int low=1;
    int upp=1;
    int spe=1;
    for(char i: x)
    {
        if(tas(i, numbers))
            num=0;
        if(tas(i, lower_case))
            low=0;
        if(tas(i, upper_case))
            upp=0;
        if(tas(i, special_characters))
            spe=0;
    }
    ans=num+low+upp+spe;
    if(n<=6)
        ans=max(ans, 6-n);
    cout<<ans;
    return 0;
}