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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin >> n;
    int bm = 1, cm = 1, dm = 1, sm = 1;
    for(int i = 0; i < n; i++){
        char ch;
        cin >> ch;
        if(ch >= 65 && ch <= 90){
            bm = 0;
        }else if(ch >= 97 && ch <= 122){
            cm = 0;
        }else if(ch >= 48 && ch <= 57){
            dm = 0;
        }else if(ch == '!' || ch == '@' || ch == '#' || ch == '$' || ch == '%' || ch == '^' || ch == '&' || ch == '*' || ch == '(' || ch == ')' || ch == '-' || ch == '+'){
            sm = 0;
        }
    }
    if(n >= 6){
        cout << bm + cm + dm + sm << "\n";
    }else{
        int ans = bm + cm + dm + sm;
        if(n + bm + cm + dm + sm < 6){
            ans += abs(n + bm + cm + dm + sm - 6);
        }
        cout << ans << "\n";
    }
    return 0;
}