#include <bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    int n,num=0,lc=0,uc=0,sc=0,extra=0;
    char ch;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>ch;
        if(numbers.find(ch)!=std::string::npos)
            num++;
        if(lower_case.find(ch)!=std::string::npos)
            lc++;
        if(upper_case.find(ch)!=std::string::npos)
            uc++;
        if(special_characters.find(ch)!=std::string::npos)
            sc++;
    }
    if(num==0)
        extra++;
    if(lc==0)
        extra++;
    if(uc==0)
        extra++;
    if(sc==0)
        extra++;
    if((n+extra)<6)
        extra+=(6-(n+extra));
    cout<<extra<<"\n";
    return 0;
}