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


int main() {
    int n;
    cin>>n;
    string s;
    cin>>s;
    int no=0,up=0,lo=0,sp=0;
    for(int i=0;i<s.size();i++){
        if(s[i]>='a' && s[i]<='z') lo++;
        else if(s[i]>='A' && s[i]<='Z') up++;
        else if(s[i]-'0'>=0 && s[i]-'0'<=9) no++;
        else sp++;
    }
    int ans=0;
    if(no==0) ans++;
    if(up==0) ans++;
    if(lo==0) ans++;
    if(sp==0) ans++;
    //cout<<"ans= "<<ans<<endl;
    if(n+ans<6) cout<<ans+6-(ans+n);
    else cout<<ans;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}