#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define fn(i,x) for(int i=0;i<x;i++)
#define fs(i,s,x) for(int i=s;i<x;i++)
#define fr(i,x) for(int i=x;i>=1;i--)
#define mp make_pair
#define W while
#define mod 1000000007
using namespace std;
int main()
{
    int n;
    cin>>n;
   char s[n];
   fn(i,n)
   cin>>s[i];
   int b=0,c=0,d=0,e=0;
   fn(i,n)
   {
   	     int a=s[i];
		 if(a>=97&&a<=122)
		 b=1;
		 if(a>=65&&a<=90)
		 c=1;
		 if(a>=48&&a<=57)
		 d=1;
		 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=1;
   }
   int ans=0;
   int x=0;
		   if(b==0)
		   x++;
		   if(d==0)
		   x++;
		   if(c==0)
		   x++;
		   if(e==0)
		   x++;
		   ans+=(max(6-n,x));
   
   cout<<ans;
   

}