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


int main() {
    int n;
    string s;
    cin >> n >> s;
    int a1 = 1;
    int a2 = 1;
    int a3 = 1;
    int a4 = 1;
    string s1("!@#$%^&*()-+");
    for (int i = 0; i < n; i++){
        if (s[i] >= 'a' && s[i] <= 'z'){
          a1 = 0;
        }
        if (s[i] >= 'A' && s[i] <= 'Z'){
            a2 = 0;
        }
        if (s[i] >= '0' && s[i] <= '9'){
            a3 = 0;
        }
        for (int j = 0; j < s1.size(); j++){
            if (s[i] == s1[j]){
              a4 = 0;
            }
        }
    }
    int r = a1+a2+a3+a4;
    int m = r;
    if (6-n > m){
        m = 6-n;
    }
    cout << m;
    return 0;
}