#include <bits/stdc++.h>
using namespace std;
int main() {
    char s[1000];
    int l,i,p=0,q=0,r=0,t=0,c=0;
    cin>>l;
    cin>>s;
    for(i=0;i<l;i++){
        if(s[i]>='a'&&s[i]<='z')
            p++;
        else if(s[i]>='A'&&s[i]<='Z')
            q++;
        else if(s[i]>='0'&&s[i]<='9')
            r++;
        else t++;
    }
    if(p==0)
        c++;
    if(q==0)
        c++;
    if(r==0)
        c++;
    if(t==0)
        c++;
    if(c+l<6)
    { p=(6-c-l);
     c+=p;}
    cout<<c;
    return 0;
}