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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int n;
    cin >> n;
    string st;
    cin >> st;
    int dig = 0;
    for(int i=0;i<n;i++){
        if(st[i]>='0' && st[i]<='9'){
            dig++;
        }
    }
    int dig1 = 0;
    for(int i=0;i<n;i++){
        if(st[i]>='a' && st[i]<='z'){
            dig1++;
        }
    }
    int dig2 = 0;
    for(int i=0;i<n;i++){
        if(st[i]>='A' && st[i]<='Z'){
            dig2++;
        }
    }
    int dig3 = 0;
    for(int i=0;i<n;i++){
        if(st[i]=='!' || st[i]=='@' || st[i]=='#' || st[i]=='$' || st[i]=='%' || st[i]=='^' || st[i]=='&' || st[i]=='*' || st[i]=='(' || st[i]==')' || st[i]=='-' || st[i]=='+'){
            dig3++;
        }
    }
    int ans = 0;
    if(dig==0){
        ans++;
    }
    if(dig1==0){
        ans++;
    }
    if(dig2==0){
        ans++;
    }
    if(dig3==0){
        ans++;
    }
    ans += max(0,6-ans-n);
    cout << ans;
    return 0;
}