#include <bits/stdc++.h>

using namespace std;



int main() {
    int n, count = 0; 
    string str;
    bool first, second, third, fourth;
    string check = "!@#$%^&*()-+";
    first = second = third = fourth = false;
    cin >> n;
    cin >> str;
    for(int i = 0; i < str.size(); i++){
        if(str.at(i) >= '0' and str.at(i) <= '9'){
            first = true;
        }
        if(str.at(i) >= 'a' and str.at(i) <= 'z'){
            second = true;
        }
        if(str.at(i) >= 'A' and str.at(i) <= 'Z'){
            third = true;
        }
        for(int j = 0; j < check.size(); j++){
            if(str.at(i) == check.at(j)){
                fourth = true;
                break;
            }
        }
    }
    if(!first){
        count++;
    }
    if(!second){
        count++;
    }
    if(!third){
        count++;
    }
    if(!fourth){
        count++;
    }
    if(n+count >= 6){
        cout << count << endl;
    }
    else{
        n += count;
        cout << 6-n+count << endl;
    }
}