#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,i=0,c=0,cp=0;
    cin>>n;
    char *s=new char[n];
    cin>>s;
    while(i<n){
        if((int)s[i]>=48 && (int)s[i]<=57){c++;break;}i++;
        }
    if(c==0){cp++;}
    i=0;c=0;
    while(i<n){
   if((int)s[i]>=65 && (int)s[i]<=90){c++;break;}i++;
        }
    if(c==0){cp++;}
    i=0;c=0;
    while(i<n){
     if((int)s[i]>=97 && (int)s[i]<=122){c++;break;}i++;
        }
    if(c==0){cp++;}
    i=0;c=0;
   // char c[]="!@#$%^&*()-+"
    while(i<n){
     if((int)s[i]<48 || ((int)s[i]>57 && (int)s[i]<65) ||  ((int)s[i]>90 && (int)s[i]<97)  ){c++;break;}i++;
        
    }    
    if(c==0){cp++;}
    i=0;c=0;
  if((n+cp)<6){
      
      cout<<cp+(6-cp-n); 
  }else{
      cout<<cp; 
  }         

    return 0;
}