#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include<string>
using namespace std;


int main() {
    ios::sync_with_stdio(false);
    int n;
    cin>>n;
    int c1=0,c2=0,c3=0,c4=0,ans=0;
        string s;
        cin>>s;
    
        string p="!@#$%^&*()-+";
        for(int i=0;i<s.size();i++){
            if(s[i]>='0' && s[i]<='9')
                c1++;
            else if(s[i]>='a'&& s[i]<='z')
                c2++;
            else if(s[i]>='A' && s[i]<='Z')
                c3++;
            else{
                   c4++;
            }
        }
        if(c1==0)
            ans++;
         if(c2==0)
                ans++;
         if(c3==0)
                ans++;
        if(c4==0)
                ans++;
    if(n+ans>=6)
          cout<<ans;
    else
        cout<<6-n;
    return 0;
}