#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;
    string s;
    cin>>n;
    cin>>s;
    string ss="!@#$%^&*()-+";
    
    int d=0,l=0,u=0,sp=0;
    for(int i=0;i<n;i++){
        if(isupper(s[i]))
           u=1;
        if(islower(s[i]))
            l=1;
        if(isdigit(s[i]))
            d=1;
        
           
    }
    /*
    for(int i=0;i<n;i++){
        if(48<=int(s[i])<=57){
            d=1;
            cout<<i<<endl;
            break;
        }
    }
    for(int i=0;i<n;i++){
        if(97<=s[i]<=122){
            l=1;
            break;
        }
    }
    for(int i=0;i<n;i++){
        if(65<=s[i]<=90){
            u=1;
            break;
        }
    }*/
    for(int i=0;i<n;i++){
        for(int j=0;j<ss.length();j++){
            if(s[i]==ss[j]){
                sp=1;
                break;
            }
        }
    }
  //  cout<<d<<' '<<l<<' '<<u<<' '<<sp<<endl;
    int t=l+d+u+sp;
    t=4-t;
    if(n<6){
        cout<<max(6-n,t)<<endl;
    }
    else
        cout<<t<<endl;
    return 0;
}