#include <bits/stdc++.h>

using namespace std;
bool nodig (string s)
{
    int i, sz = s.length();
    for (i=0; i<sz; i++)
    {
        if (s[i]<='9' && s[i]>='0')
            return false;
    }
    return true;
}
bool nolow (string s)
{
    int i, sz = s.length();
    for (i=0; i<sz; i++)
    {
        if (s[i]<='z' && s[i]>='a')
            return false;
    }
    return true;
}
bool noup (string s)
{
    int i, sz = s.length();
    for (i=0; i<sz; i++)
    {
        if (s[i]<='Z' && s[i]>='A')
            return false;
    }
    return true;
}
bool nosp (string s)
{
    int i, sz = s.length();
    for (i=0; i<sz; i++)
    {
        if (s[i]=='!' || s[i]=='@' || s[i]=='#' || s[i]=='$' || s[i]=='%' || s[i]=='^' || s[i]=='&' || s[i]=='*' || s[i]=='(' || s[i]==')' || s[i]=='-' || s[i]=='+')
            return false;
    }
    return true;
}
int minimumNumber(int n, string pass) {
    int cnt = 0;
    if (nodig(pass))
        cnt++;
    if (nolow(pass))
        cnt++;
    if (noup(pass))
        cnt++;
    if (nosp(pass))
        cnt++;
    if (n+cnt<6)
        return 6-n;
    return cnt;
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}