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


int main() {
    int n;
    cin>>n;
    string arr;
    cin>>arr;
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
      int len=arr.size(),i=0,cno=0,cA=0,ca=0,cs=0;
     while(i<len)
    {  if(numbers.find(arr[i])!=string::npos)
           cno++;
          else if(lower_case.find(arr[i])!=string::npos)
           ca++;
             else if(upper_case.find(arr[i])!=string::npos)
           cA++;
                else if(special_characters.find(arr[i])!=string::npos)
               cs++;
    i++;                    
    }
                int ans=0;
      if(cno==0) 
       ans+=1;
      if(ca==0) 
       ans+=1;
      if(cA==0) 
       ans+=1;
      if(cs==0) 
       ans+=1;
    
           if(len+ans<6)             
                 ans+=6-len-ans;
                        cout<<ans;
    return 0;
}