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

bool findif(string s1,string s2,int n,int m){
    for(int i=0;i<n;i++)
        for(int j=0;j<m;j++)
            if(s1[i]==s2[j])
                return true;
    return false;
}


int main() {
        string numbers = "0123456789", lower_case = "abcdefghijklmnopqrstuvwxyz", 
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ", special_characters = "!@#$%^&*()-+";
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    cin>>n;
    string pass;
    cin>>pass;
    int count=0;
    if(!findif(pass,numbers,n,10)) count+=1;
    if(!findif(pass,lower_case,n,26)) count+=1;
    if(!findif(pass,upper_case,n,26)) count+=1;
    if(!findif(pass,special_characters,n,12)) count+=1;
    if(count+n<6) count+=6-(count+n);
    cout<<count<<endl;
    return 0;
}