#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <list>
#define pie 3.141592653589793
#define si(a) scanf("%d",&a)
#define ss(a) scanf("%s",a)
#define sl(a) scanf("%lld",&a)
#define pi(a) printf("%d",a)
#define pl(a) printf("%lld",a)
#define ps(a) printf("%s",a)
#define ll long long
using namespace std;
int main()
{
  int n;
  string str;
  cin >> n >> str;
  int f1=0,f2=0,f3=0,f4=0,f5=0;
  if(str.length()>=6)
    f1=1;
  for(int i=0;i<str.length();i++){
    if(str[i]=='0' || str[i]=='1' || str[i]=='2' || str[i]=='3' || str[i]=='4' || str[i]=='5' || str[i]=='6' || str[i]=='7' || str[i]=='8' || str[i]=='9')
      f2=1;
  }
  for(int i=0;i<n;i++){
    if(str[i]>=65 && str[i]<=90)
      f3=1;
  }
  for(int i=0;i<n;i++){
    if(str[i]>=97 && str[i]<=122)
      f4=1;
  }
  for(int i=0;i<str.length();i++){
    if(str[i]=='!' || str[i]=='@' || str[i]=='#' || str[i]=='$' || str[i]=='%' || str[i]=='^' || str[i]=='&' || str[i]=='*' || str[i]=='(' || str[i]==')' || str[i]=='-' || str[i]=='+')
      f5=1;
  }
  if(f1==0){
    int k = f2+f3+f4+f5;
    int ans = 4-k;
    n+=ans;
    if(n>=6)
      cout << ans << endl;
    else{
      ans+=(6-n);
      cout << ans << endl;
    }
  }
  else{
    int k = f2+f3+f4+f5;
    int ans = 4-k;
    cout << ans << endl;
  }
  return 0;
}