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

char special[12] = {'!','@','#','$','%','^','&','*','(',')','-','+'};

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
        int n;
        cin >> n;

        string in;
        cin >> in;

        bool check[5] = {0,};

        check[0] = (n >= 6);
        for(int i = 0; i < n; ++i) {
                if(in[i] >= '0' && in[i] <= '9') check[1] = true;
                if(in[i] >= 'a' && in[i] <= 'z') check[2] = true;
                if(in[i] >= 'A' && in[i] <= 'Z') check[3] = true;
                for(int j = 0; j < 12; ++j) {
                        if(in[i] == special[j]){
                                check[4] = true;
                        }
                }
        }

        int answer = 0;
        for(int i = 1; i < 5; ++i) {
                if(!check[i]) answer++;
        }

        int len = in.length();
        if(!check[0]) {
                answer = max(answer, 6 - len);
        }

        cout << answer;

    return 0;
}