#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
  string numbers = "0123456789";
  string lower_case = "abcdefghijklmnopqrstuvwxyz";
  string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  string special_characters = "!@#$%^&*()-+";
  int nums = 0,lower = 0, upper = 0, special = 0;
  int count = 0;
  for(char c: password){
    if(numbers.find(c) != string::npos){
      nums++;
    }else if(c >= 'a' && c <= 'z'){
      lower++;
    }else if(c >= 'A' && c <= 'Z'){
      upper++;
    }else if(special_characters.find(c) != string::npos){
      special++;
    }
  }
  if(nums == 0){
    count++;
  }
  if(lower == 0){
    count++;
  }
  if(upper == 0){
    count++;
  }
  if(special == 0){
    count++;
  }
  if((count + n) < 6){
    count += (6 - (count + n));
  }
  return count;

}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}