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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    string numbers = "0123456789\0";
    string lower_case = "abcdefghijklmnopqrstuvwxyz\0";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\0";
    string special_characters = "!@#$%^&*()-+\0";
    int n;
    cin>>n;
    string s;
    cin>>s;
    int count=0,f=0;
    for(int i=0;i<n;i++)
    {
        if(((s[i]-'0')<=9)&&((s[i]-'0')>=0))
        {
            f=1;
            break;
        }
    }
    if(f==0)
    {
        count++;
    }
    f=0;
    for(int i=0;i<n;i++)
    {
        if(((s[i]-'a')<=25)&&((s[i]-'a')>=0))
        {
            f=1;
            break;
        }
    }
    if(f==0)
    {
        count++;
    }
    f=0;
    for(int i=0;i<n;i++)
    {
        if(((s[i]-'A')<=25)&&((s[i]-'A')>=0))
        {
            f=1;
            break;
        }
    }
    if(f==0)
    {
        count++;
    }
    f=0;
    for(int i=0;i<n;i++)
    {
        if((s[i]=='!'))
        {
            f=1;
            break;
        }
        if((s[i]=='@'))
        {
            f=1;
            break;
        }
        if((s[i]=='#'))
        {
            f=1;
            break;
        }
        if((s[i]=='$'))
        {
            f=1;
            break;
        }
        if((s[i]=='%'))
        {
            f=1;
            break;
        }
        if((s[i]=='^'))
        {
            f=1;
            break;
        }
        if((s[i]=='&'))
        {
            f=1;
            break;
        }
        if((s[i]=='*'))
        {
            f=1;
            break;
        }
        if((s[i]=='('))
        {
            f=1;
            break;
        }
        if((s[i]==')'))
        {
            f=1;
            break;
        }
        if((s[i]=='-'))
        {
            f=1;
            break;
        }
        if((s[i]=='+'))
        {
            f=1;
            break;
        }
    }
    if((f==0))
    {
        count++;
    }
    int need=6-n;
    if((count<need))
        count=need;
    cout<<count<<endl;
    return 0;
}