#include <bits/stdc++.h>
#include<string>
using namespace std;

int minimumNumber(int n, string password) {
    int count=0;
    bool flag;
    if(password.length()>=6)
    flag=true;
     else
     flag=false;
    
    int num=0;
    int low=0;
    int up=0;
    int special=0;
   for(int i=0;i<n;i++)
   {
       if((int)(password[i])>=65 && (int)(password[i])<=90)
        up++;
        if((int)(password[i])>=97 && (int)(password[i])<=122)
        low++;
       if((int)(password[i])>=0 && (int)(password[i])<=9 )
       num++;
       if(password[i]=='!' || password[i]=='@' || password[i]=='#' || password=='$'|| password[i]=='*'||password[i]=='()'||password[i]=='-'||password[i]=='+')
           special++;
   }
    
    if(up==0)
        count++;
    if(num==0)
        count++;
    if(low==0)
        count++;
    if(special==0 
        count++;
    if(flag==false)
    {
        return((count+(6-(password.length()+count))));
    }
    else
        return count;
}

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