#include <bits/stdc++.h>

using namespace std;

ifstream in("input.txt");
ofstream out("output.txt");

set <char> numbers ={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
set <char> lower_case = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
set <char> special_characters = {'!','@','#','$','%','^','&','*','(',')','-','+'};
set <char> upper_case;
int N;

int main(){
    for(char a='A'; a<='Z'; a++){
        upper_case.insert(a);
    }

    cin >> N;
    int cont=0;
    bool n=false, l=false, s=false, u=false;

    for(int i=0; i<N; i++){
        char c;
        cin >> c;
        if(numbers.find(c)!=numbers.end()){
            n=true;
        }
        else if(lower_case.find(c)!=lower_case.end()){
            l=true;
        }
        else if(special_characters.find(c)!=special_characters.end()){
            s=true;
        }
        else if(upper_case.find(c)!=upper_case.end()){
            u=true;
        }

        cont++;
    }
    int sol=0;
    if(!n){
        sol++;
    }
    if(!u)
        sol++;
    if(!s)
        sol++;
    if(!l)
        sol++;
    if(N+sol<6){
        sol=6-N;
    }
    cout << sol;
}