#include <algorithm>
#include <iostream>
#include <bits/stdc++.h>
#include  <string>
#include<iterator>
#define INF 1e9 + 7
#define upsilon 1e-9

using namespace std;
int main()
{
    int t, n, m;
    string s1;
    cin>>n;
    cin>>s1;
    bool p=1, l=1, u=1, d=1;
    for (char i: s1){
        ispunct(i)? p=0: p=p ;
        isdigit(i)? d=0: d=d;
        islower(i)? l=0: l=l;
        isupper(i)? u=0: u=u;
    }
    m = p + d + l + u;
    n+m >=6 ? cout<<m : cout<<6-n ;
    //cout<<m;
    //cout<<u<<l<<p<<d;

}