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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    string s;
    int n;
    cin >>n >> s;
     set<char> ch = {'!','@','#','$','%','^','&','*','(',')','-','+'};
    int d = 1, u = 1,l =1,sp =1;
    int ans = max(0,6 - (int)s.length() );
    for(auto c : s){
    //    cout << c << "\n";
        if(ch.find(c) != ch.end()) sp = 0;
        else if(isdigit(c)) d =0;
        else if(isalpha(c) && isupper(c)) u =0;
        else if(isalpha(c) && islower(c)) l =0;
    }
 //  cout << d << u << l << sp << "\n";
    int val = d + u + l + sp;
    ans = max(ans,val);
    cout << ans ;
    return 0;
}