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


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