#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    string p;
    cin >> p;
    int ans = 4;
    for(int i = 0; i < p.size(); i++)
        if(p[i]-'a' >=0 && p[i]-'a'< 26){
            ans --;
            break;
        } 

    for(int i = 0; i < p.size(); i++)
        if(p[i]-'A' >=0 && p[i]-'A'< 26){
            ans --;
            break;
        } 
    
    for(int i = 0; i < p.size(); i++)
        if(p[i]-'0' >=0 && p[i]-'0'< 10){
            ans --;
            break;
        } 
    
    for(int i = 0; i < p.size(); i++)
        if(p[i] =='!' || p[i] =='@' || p[i] =='#' || p[i] =='$' || p[i] =='%' || p[i] =='^' || p[i] =='&' || p[i] =='*' || p[i] =='(' || p[i] ==')' || p[i] =='-' || p[i] =='+'){
            ans --;
            break;
        } 

    ans = p.size()+ans < 6 ? 6-p.size() : ans;
    
    cout << ans << endl;
    return 0;
}