#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define mp make_pair
#define fi first
#define se second
#define pb push_back
using namespace std;
ll n, a, b, c, d;
string s;
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >>n;
    cin >>s;
    a = 1;
    b = 1;
    c = 1;
    d = 1;
    for (int i = 0; i < s.size(); ++i){
        if (s[i] >= 'a' && s[i] <= 'z')a = 0;
        if (s[i] >= 'A' && s[i] <= 'Z')b = 0;
        if (s[i] >= '0' && s[i] <= '9')c = 0;
        if (s[i] == '!' || s[i] == '@' || s[i] == '#' || s[i] == '$' || s[i] == '%' || s[i] == '^' ||
            s[i] == '&' || s[i] == '*' || s[i] == '(' || s[i] == ')' || s[i] == '-' || s[i] == '+')d = 0;
    }
    a = a + b + c + d;
    cout <<max(6 - n, a);
}