#include <bits/stdc++.h>

using namespace std;


int main() {
    int n;
    cin >> n;
    char c;
    int digit = 0, low = 0, big = 0, spec = 0, sol = 0;
    for (int i = 1; i <= n; i++)
    {
        cin >> c;
        if ('0' <= c && c <= '9')
            digit = 1;
        else if ('a' <= c && c <= 'z')
            low = 1;
        else if ('A' <= c && c <= 'Z')
            big = 1;
        else spec = 1;
    }
    
    if (digit == 0)
        sol++;
    if (low == 0)
        sol++;
    if (big == 0)
        sol++;
    if (spec == 0)
        sol++;
    if (6 > sol + n)
        sol += (6 - n - sol);
    cout << sol;
    return 0;
}