#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string s) {
    int f1=1,f2=1,f3=1,f4=1,f5=1;
    
    for(int i=0;i<n;i++){
        if((48<=s[i] && s[i]<=57))
           f2=0;
    }
    
    for(int i=0;i<n;i++){
        if((97<=s[i] && s[i]<=121))
           f3=0;
    }
    
    for(int i=0;i<n;i++){
        if((65<=s[i] && s[i]<=90))
           f4=0;
    }
    
    for(int i=0;i<n;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]=='+')
           f5=0;
    }
    
    int num = f2+f3+f4+f5;
    if(n+num<6)
        num+=(6-n-num);
        
    return num;
    
    
}

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