#include <bits/stdc++.h>

using namespace std;
int a,b,c[1000000];
string s;
string numbers = "0123456789";
string lower_case = "abcdefghijklmnopqrstuvwxyz";
string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string special_characters = "!@#$%^&*()-+";
int l,u,n,ss,resenje;
int main()
{
    ios_base::sync_with_stdio(0);
    cin>>a;
    cin>>s;
    for(int i=0;i<a;i++)
    {
        if(s[i]<='z' && s[i]>='a')
            l++;
        if(s[i]<='Z' && s[i]>='A')
            u++;
        if(s[i]<='9' && s[i]>='0')
            n++;
        if(s[i]=='!' || s[i]=='@' || s[i]=='#' || s[i]=='$' || s[i]=='%' || s[i]=='^' || s[i]=='&' || s[i]=='*' || s[i]=='(' || s[i]==')' || s[i]=='-' || s[i]=='+')
            ss++;
    }
    if(l==0)
        resenje++;
    if(u==0)
        resenje++;
    if(ss==0)
        resenje++;
    if(n==0)
        resenje++;
    int razlika=6-a;
    int sol=0;
    if(razlika>0)
        sol=razlika;
    if(resenje-razlika>0)
        sol=resenje;
    cout<<sol;
    return 0;
}