#include<iostream>
using namespace std;
int main() {
    int n,b,c,e,f,c1,i,j;
    b=0;c=0;e=0;f=0;c1=0;
    cin >> n;string a,d ;
    cin>>a;d="!@#$%^&*()-+";
    for(i=0;i<n;i++){
        if(a[i]>=48&&a[i]<=57)
            b=1;
        if(a[i]>=65&&a[i]<=90)
            c=1;
        if(a[i]>=97&&a[i]<=122)
            f=1;
        if(e==0){
        for(j=0;j<12;j++){
            if(d[j]==a[i])
                e=1;
        }
    }
    }if(b==0)
        c1++;
    if(c==0)
        c1++;
    if(e==0)
        c1++;
    if(f==0)
        c1++;
    if(c1+n<6)
        c1=6-n;
    cout<<c1;
 
}