#include <iostream>

#include <cstring>
#include <cctype>

#include <string>
#include <vector>
#include <algorithm>

using namespace std;

#define SZ(a) int((a).size())
#define REP(i,n) for(int i=0,_n=(n);i<_n;++i)
#define FOR(i,a,b) for(int i=(a),_b=(b);i<=_b;++i)

typedef long long llong;
typedef vector<int> VI;
typedef vector<VI> VVI;



int main(int argc, char* argv[]) {
   int N;
   cin >> N;

   string S;
   cin >> S;

   int ndig = 0, nlower = 0, nupper = 0, nspecial = 0;
   for (char c : S) {
      if (isdigit(c))
         ++ndig;
      else if (islower(c))
         ++nlower;
      else if (isupper(c))
         ++nupper;
      else
         ++nspecial;
   }

   int nreq = 0;
   if (ndig == 0)
      ++nreq;
   if (nlower == 0)
      ++nreq;
   if (nupper == 0)
      ++nreq;
   if (nspecial == 0)
      ++nreq;

   N += nreq;
   if (N < 6)
      nreq += 6 - N;

   cout << nreq << endl;

   return 0;
}