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


int main() {
    string numbers = "0123456789";
 string lower_case = "abcdefghijklmnopqrstuvwxyz";
string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string special_characters = "!@#$%^&*()-+";
    int n;
    cin>>n;
    string s;
    cin>>s;
    int flag =0,cnt=0;
    for(int i=0;i<numbers.size();i++)
    {
  
        for(int j=0;j<n;j++)
        {
            if(s[j]==numbers[i])
            {
                flag = 1;break;
            }
        }
        if(flag) break;
    }
    if(!flag) cnt++;
    else flag =0;
    for(int i=0;i<lower_case.size();i++)
    {
  
        for(int j=0;j<n;j++)
        {
            if(s[j]==lower_case[i])
            {
                flag = 1;break;
            }
        }
        if(flag) break;
    }
    if(!flag) cnt++;
    else flag =0;
    for(int i=0;i<special_characters.size();i++)
    {
  
        for(int j=0;j<n;j++)
        {
            if(s[j]==special_characters[i])
            {
                flag = 1;break;
            }
        }
        if(flag) break;
    }
    if(!flag) cnt++;
    else flag =0;
    for(int i=0;i<upper_case.size();i++)
    {
  
        for(int j=0;j<n;j++)
        {
            if(s[j]==upper_case[i])
            {
                flag = 1;break;
            }
        }
        if(flag) break;
    }
    if(!flag) cnt++;
    else flag =0;
    
    if(n+cnt<6) cnt+=(6-n-cnt);
    cout<<cnt;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}