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


int main() {
    int n,cnt=0;
    string s;
    cin>>n;
    cin>>s;
    for(int i=0;i<n;i++)
    {
        if(s[i]>='a' && s[i]<='z'){cnt++;break;}
    }
    for(int i=0;i<n;i++)
    {
       if(s[i]>='A' && s[i]<='Z'){cnt++;break;}
    }
    for(int i=0;i<n;i++)
    {
       if(s[i]>=48 && s[i]<=57){cnt++;break;}
    }
    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]=='^' ){cnt++;break;}
    }
    if(n>=6)cout<<4-cnt;
    else if(n+(4-cnt) >=6)cout<<4-cnt;
    else if(n+(4-cnt)<6)cout<<6-n;
    return 0;
}