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

bool isnum(char c){
    string s = "0123456789";
    for ( int i = 0; i < 10; ++i ){
        if( c == s[i]) 
            return true;
    }
    return false;
}

bool ischar(char c){
    string s = "abcdefghijklmnopqrstuvwxyz";
    for ( int i = 0; i < s.length(); ++i ){
        if( c == s[i]) 
            return true;
    }
    return false;
}

bool ischarbig(char c){
    string s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    for ( int i = 0; i < s.length(); ++i ){
        if( c == s[i]) 
            return true;
    }
    return false;
}

bool isspec(char c){
    string s = "!@#$%^&*()-+";
    for ( int i = 0; i < s.length(); ++i ){
        if( c == s[i]) 
            return true;
    }
    return false;
}


int main() {
    string s;
    int n;
    cin >> n;
    cin >> s;
    int count1 = 0;
    for ( int i =0 ; i < n; ++i ){
        if( isnum(s[i])){
            count1 += 1;
            break;
        }
    }
        for ( int i =0 ; i < n; ++i ){
        if( ischar(s[i])){
                        count1 += 1;
            break;
        }

    }
    for ( int i =0 ; i < n; ++i ){
        if( ischarbig(s[i])){
            count1 += 1;
            break;
        }
         
    }
    for ( int i =0 ; i < n; ++i ){
        if( isspec(s[i])){
            count1 += 1;
            break;
        }
    }
    
    int extra = 4 - count1;
    //cout << extra << endl;
    int extra2 = 0;
    int ans = 0;
    if ( n  < 6 ){
        extra2 = 6 - n;
        ans += extra2;
        extra -= extra2;
        extra = 0 > extra ? 0 : extra;
    }
    
    cout << ( ans + extra ) << endl;    
    
    return 0;
}