#include <bits/stdc++.h>

using namespace std;


int main() {
    int n;
    cin >> n;
    string p;
    cin >> p;
    int a=0;
    int l=p.length();
    int d=0,s=0,c=0,sp=0;
    for(int i=0;i<l;i++)
    {
        if(p[i]>='a'&&p[i]<='z')
            s++;
        else if(p[i]>='A'&&p[i]<='Z')
            c++;
        else if(p[i]>='0'&&p[i]<='9')
            d++;
        else
            sp++;
    }
    if(d==0)
        a++ ,l++;
    if(s==0)
        a++ ,l++;
    if(c==0)
        a++ ,l++;
    if(sp==0)
        a++ ,l++;
    if(l<=6)
        a+=6-l;
    cout << a << endl;
    return 0;
}