#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n; int low=1, upp=1, num=1, sp=1, ex=0;
    string s;
    cin>>n>>s;
    for(int i=0; i<s.length(); i++)
    {
        if(isdigit(s[i])) num=0;
        else {
           if(islower(s[i])) low=0;
           else 
           {
               if(isupper(s[i])) upp=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]=='+') {
                       sp=0;
                   }
               }
           }
        }
    }
    ex=low+upp+num+sp;
    int len=max(0,6-int(s.length()));
    cout<<max(len,ex)<<"\n";
    
    return 0;
}