#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 upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string lower = "abcdefghijklmnopqrstuvwxyz";
    string digit="0123456789";
    string special = "!@#$%^&*()-+";
    string s;
    cin>>s;
    int count = 0;
    
        for(int j=0;j<n;j++){
            if(upper.find(s[j])<upper.size()){
                count++;
                break;
            }
        }
        for(int j=0;j<n;j++){
            if(lower.find(s[j])<lower.size()){
                count++;
                break;
            }
        }
        for(int j=0;j<n;j++){
            if(digit.find(s[j])<digit.size()){
                count++;
                break;
            }
        }
        for(int j=0;j<n;j++){
            if(special.find(s[j])<special.size()){
                count++;
                break;
            }
        }
    if(n>6){
        if(count<4){
            cout<<4-count;
        }
        else{
            cout<<'0';
        }
    }
    else{
        if(count==4){
            cout<<6-n;
        }
        else{
            if(n+(4-count)<6){
                cout<<6-n;
            }
            else{
                cout<<4-count;
            }
        }
    }
    return 0;
}