#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pi;

typedef vector<int> vi;
typedef vector<ll> vll;
#define FOR(i,n) for (i = 0; i < n; ++i)
#define FORK(i,k,n) for (i = k; i <= n; ++i)
#define FORR(i,k,n) for (i = k; i >= n; --i)

#define re(a,b)   memset(a,b,sizeof(a))
#define sz(a)      (int)(a.size())
#define MIN(a,b)     (a) = min((a),(b))
#define MAX(a,b)     (a) = max((a),(b))
#define input(in)    freopen(in,"r",stdin)
#define output(out)  freopen(out,"w",stdout)
#define ALL(a)       a.begin(),a.end()
#define RALL(a)      a.rbegin(),a.rend()
#define LEN(a)       (int)(a.length())

#define FIN(x)       freopen(x,"r",stdin)
#define FOUT(x)      freopen(x,"w",stdout)
#define FCLOSE       {fclose(stdin); fclose(stdout);}

#define fi           first
#define se           second
#define pb           push_back
#define mp           make_pair
#define  M           100001
#define INF          1001001001
#define MOD          1000000007
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    ll n,i,aj=0;
    cin>>n;
    string s;
    cin>>s;
    ll a=1,b=1,c=1,d=1,e=-1;
    for(i=0;i<s.size();i++)
    {
       if(s[i]-'0'>=0&&s[i]-'0'<=9)
           a=0;
        if(s[i]>=97&&s[i]<=122)
            b=0;
        if(s[i]>=65&&s[i]<=90)
            c=0;
        if(s[i]=='!'||s[i]=='@'||s[i]=='#'||s[i]=='$'||s[i]=='%'||s[i]=='@'||s[i]=='!^'||s[i]=='&'||s[i]=='*'||s[i]=='('||s[i]==')'||s[i]=='+'||s[i]=='-')
            d=0;
    }
    int m=a+b+c+d+s.size();
    if(m<=6)
        cout<<6-s.size();
    else
        cout<<m-s.size();
   return 0;
}