#include<iostream>

using namespace std;

int main()
{
   int n;
   cin>>n;
   string s;
   cin>>s;

   bool a=0, b=1, c =1, d =1,e=1;
   if(n < 6)
      a = 1;
   for(int i=0; i<s.size(); i++)
   {
      if( (s[i] >= 'a') && (s[i] <= 'z') )
         b = 0;
      else if( (s[i]>= 'A') && (s[i]<='Z') )
         c = 0;
      else if( (s[i]>='0') && (s[i]<='9') )
         d = 0;
      else 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] == '+') )
         e = 0;
   }

   int result = 0;
   if(b)
      result++;
   if(c)
      result++;
   if(d)
      result++;
   if(e)
      result++;

   if(a)
   {
      int temp = 6 - s.size() - result;
      if(temp > 0)
         result += temp;
   }
   cout<<result;
   return 0;
}