#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    int num=1;
    int small=1;
    int capital =1;
    int special =1,result=0;
    for(int i=0;i<password.length();i++)
    {
        if(password[i]>=48 && password[i] <= 57)
        {num=0;
           
        }
        
         if(password[i]>=33 && password[i] <= 45)
        {special=0;
            
        }
          if(password[i]>=65 && password[i] <= 90)
        {capital=0;
           
        }
          if(password[i]>=97 && password[i] <= 122)
        {small=0;
           
        }
        
        
    }
    result = num+special+small+capital;
    if(n+result >= 6)
        return result;
    else
        return 6-n;
    
    
}

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