#include <regex>
#include <iostream>

using namespace std;
int main(int argc, char** argv){
    int length;
    cin >> length;
    string pass;
    cin >> pass;
    int minumtoadd=0;
    if(length<6)minumtoadd=6-length;

    int toadd=0;
    smatch s;
    if(!regex_search(pass,s,std::regex(R"([A-Z]+)")))
        toadd++;
    if(!regex_search(pass,s,std::regex(R"([a-z]+)")))
        toadd++;
    if(!regex_search(pass,s,std::regex(R"(\d+)")))
        toadd++;
    if(!regex_search(pass,s,std::regex(R"([!@#$%^&*()\-+]+)")))
        toadd++;

    if(toadd>minumtoadd)minumtoadd=toadd;
    cout << minumtoadd << endl;

}