#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    int flg1=1,flg2=1,flg3=1,flg4=1;
    int len=password.length();
    for(int i=0;i<password.length();i++)
    {
        if(password[i]>=65&&password[i]<=90)    flg1=0;
        else if(password[i]>=97&&password[i]<=122)    flg2=0;
        else if(password[i]>=48&&password[i]<=57)    flg3=0;
        else if(password[i]=='!'||password[i]=='@'||password[i]=='#'||password[i]=='$'||password[i]=='%'||password[i]=='^'||password[i]=='&'||password[i]=='*'||password[i]=='('||password[i]==')'||password[i]=='-'||password[i]=='+')
            flg4=0;
    }
    if(flg1)    len++;
    if(flg2)    len++;
    if(flg3)    len++;
    if(flg4)    len++;
    if(len<6)   len=6;
    return len-n;
}

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