/*
	Swamy Saranam

	Date	: 02/11/2017 20:22:07
	Author	: Krishna Mohan A M
	Problem	:
	Status	:
*/
#include <bits/stdc++.h>

using namespace std;

typedef long double ld;

typedef long long ll;
typedef pair<int,int>	pii;
typedef pair<ld,ld>	pdd;
typedef vector<int> vi;
typedef vector<ld> vd;
typedef pair<ll,ll> pl;

#define FASTIO                ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
#define FOR(i,a,b)            for(int i=(a);i<(b);i++)
#define REP(i,n)		      FOR(i,0,n)
#define SORT(v)               sort((v).begin(),(v).end())
#define UN(v)                 SORT(v),(v).erase(unique((v).begin(),(v).end()),(v).end())
#define CL(a,b)               memset(a,b,sizeof a)
#define pb                    push_back
#define x                     first
#define y                     second
#define endl                  "\n"
#define sendl                 " \n"

const int mod = 1000000007;

int n, ans;
string st;

inline bool checkLength(){
      return n>=6;
}

inline bool checkDigit(){
      for(char it : st){
            if(it-'0' >=0 && it-'0'<10)
                  return true;
      }
      return false;
}

inline bool checkCaps(){
      for(char it : st){
            if(it-'A' >=0 && it-'A'<27)
                  return true;
      }
      return false;
}

inline bool checkLows(){
      for(char it : st){
            if(it-'a' >=0 && it-'a'<27)
                  return true;
      }
      return false;
}

inline bool checkSpl(){
      string spl = "!@#$%^&*()-+";
      for(char it : st){
            for(char s : spl){
                  if(it==s)
                        return true;
            }
      }
      return false;
}

int main()
{
      FASTIO
      cin>>n;
      cin>>st;
      if(!checkSpl())
            ans++;
            // cout<<ans<<"\n";
      if(!checkLows())
            ans++;
            // cout<<ans<<"\n";
      if(!checkCaps())
            ans++;
            // cout<<ans<<"\n";
      if(!checkDigit())
            ans++;
            // cout<<ans<<"\n";
      if(n+ans<6){
            ans += (6-n-ans);
      }
      cout<<ans<<"\n";
      return 0;
}