#include <bits/stdc++.h>

using namespace std;
bool number, lower_case, upper_case, special;
string str;
int len;

inline void check(void)
{
    for (int i = 0; i < str.size(); i++) {
        if (str[i] == '0' or str[i] == '1' or str[i] == '2' or str[i] == '3' or str[i] == '4' or str[i] == '5' or
            str[i] == '6' or str[i] == '7' or str[i] == '8' or str[i] == '9') {
                number = true;
            }
        if (str[i] == '!' or str[i] == '@' or str[i] == '#' or str[i] == '$' or str[i] == '%' or
                 str[i] == '^' or str[i] == '&' or str[i] == '*' or str[i] == '(' or str[i] == ')' or str[i] == '+' or str[i] == '-') {
            special = true;
        }
        if (str[i] >= 65 and str[i] <= 91) {
            upper_case = true;
        }
        if (str[i] >= 97 and str[i] <= 123) {
            lower_case = true;
        }
    }
}

inline int solve(void)
{
    int res = 0;
    check();
    //cout << number << " " << lower_case << " " << upper_case << " " << special << endl;
    if (!number)
        res++;
    if (!lower_case)
        res++;
    if (!upper_case)
        res++;
    if (!special)
        res++;
    if (res + len < 6) {
        res += 6 - (res + len);
    }
    return res;
}

int main(void)
{
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    //system("color f0");

    cin >> len >> str;
    cout << solve() << endl;
    //cout << 'a' - 97 << endl;
    return 0;
}