#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,u = 0,l = 0,d = 0,s = 0,count = 0;
    char a[1000];
    cin>>n;
    scanf("%s",a);
    for(int i = 0; i<n && (u == 0 || l == 0 || d == 0 || s == 0); i++){
        if(a[i]>=97 && a[i]<=122)
            l = 1;
        else if(a[i]>=65 && a[i]<=90)
            u = 1;
        else if(a[i]>=48 && a[i]<=57)
            d = 1;
else if(a[i]=='!'||a[i]=='@'||a[i]=='#'||a[i]=='$'||a[i]=='%'||a[i]=='^'||a[i]=='&'||a[i]=='*'||a[i]=='('||a[i]==')'||a[i]||a[i]=='+')
            s = 1;
    }
    count = 0;
    if(u == 0)
        count++;
    if(l == 0)
        count++;
    if(d == 0)
        count++;
    if(s == 0)
        count++;
    if(n+count<6)
        cout<<(count+(6-(count+n)))<<"\n";
    else
        cout<<count<<"\n";
    return 0;
}