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


int main() {
    int n;
    int count=0;
    int check[5]={0};
    cin>>n;
    char s[n];
    for(int i=0; i<n; i++){
        cin>>s[i];
    }
    if(n>=6){
        count++;
        check[0]=1;}
    for(int i=0; i<n; i++){
        if(check[1]==0){
            if(s[i]>=48&&s[i]<=57){
                check[1]=1;
                count++;
            }
        } if(check[2]==0){
            if(s[i]>=97&&s[i]<=122){
                check[2]=1;
                count++;
            }
        } if(check[3]==0){
            if(s[i]>=65&&s[i]<=90){
                check[3]=1;
                count++;
            }
        }if(check[4]==0){
            if(s[i]==33||s[i]==35||s[i]==36||s[i]==37||s[i]==38||s[i]==40||s[i]==41||s[i]==42||s[i]==43||s[i]==45||s[i]==94||s[i]==64){
                check[4]=1;
                count++;
            }
        }
    }
    //cout<<count<<endl;
    if(check[0]==1){
        cout<<(5-count)<<endl;
    }else{
        if((4-count)<=(6-n))
            cout<<6-n<<endl;
        else
            cout<<4-count<<endl;
    }
        
    return 0;
}