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

bool hasUpper(string s){
    for(int i = 0; i < s.length(); i++){
        if(int(s[i]) >= 65 && int(s[i]) <= 90) return true;
    }
    return false;
}

bool haslower(string s){
    for(int i = 0; i < s.length(); i++){
        if(int(s[i]) >= 97 && int(s[i]) <= 122) return true;
    }
    return false;
}

bool hasDigit(string s){
    for(int i = 0; i < s.length(); i++){
        if(int(s[i]) >= 48 && int(s[i]) <= 57) return true;
    }
    return false;
}

bool hasSpecial(string s){
    for(int i = 0; i < s.length(); i++){
        if(s[i] == '!' || s[i] == '@' || s[i] == '#' || s[i] == '$'
         || s[i] == '%' || s[i] == '^' || s[i] == '&' || s[i] == '*'
          || s[i] == '(' || s[i] == ')' || s[i] == '-' || s[i] == '+') return true;
    }
    return false;
}

int main() {
    int n; cin >> n;
    string pass; cin >> pass;
    int res = 0;

    if(!hasUpper(pass)) res++;
    if(!haslower(pass)) res++;
    if(!hasSpecial(pass)) res++;
    if(!hasDigit(pass)) res++;

    if(res + pass.length() < 6){
        res += 6 - (res + pass.length());
    }

    cout << res;
    return 0;
}