#include <bits/stdc++.h>
using namespace std;

int main(){
    string sp = "!@#$%^&*()-+";
    int n; cin >> n;
    string s; cin >> s;
    int f[4] = { 0 };
    int ans = 0;
    for(int i = 0; i < s.length(); i++){
        if(s[i] >= '0' && s[i] <= '9') f[0]++;
        if(s[i] >= 'a' && s[i] <= 'z') f[1]++;
        if(s[i] >= 'A' && s[i] <= 'Z') f[2]++;
        if(f[3] < 1){
            for(int j = 0; j < sp.length(); j++)
                if(s[i] == sp[j]) f[3]++;
        }
    }
    for(int i = 0; i < 4; i++){
        if(f[i] < 1)
            ans++;
    }
    if(n+ans < 6) cout << (6-n);
    else    cout << ans;
    return 0;
}