#include<iostream>
#include<algorithm>
#include<stdlib.h>
#include<string.h>
#include<vector>
#include<fstream>
#include<list>
#include<iomanip>
#define MIN(a,b) (((a)<(b))?(a):(b))
using namespace std;
char numbers[] = "0123456789",lower_case[] = "abcdefghijklmnopqrstuvwxyz",upper_case[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",special_characters[] = "!@#$%^&*()-+";
bool present(char psswd[],char str[])
{

    int len1 = strlen(psswd), len2 = strlen(str);
    for(int i=0;i<len2;i++)
    {
        for(int j=0;j<len1;j++)
            if(str[i]==psswd[j])
              return true;
    }
    return false;
}
int main()
{
 int len,toadd = 0;
 char psswd[105];
 cin>>len;
 cin>>psswd;
 //if(len<6)
   // toadd+=6-len;
 if(!present(psswd,numbers))
 {
     toadd++;
 }
 if(!present(psswd,lower_case))
 {
     toadd++;
 }
 if(!present(psswd,upper_case))
 {
     toadd++;
 }
 if(!present(psswd,special_characters))
 {
     toadd++;
 }

 if((toadd+len)<6)
 {
     toadd+=6-(toadd+len);
 }
 cout<<toadd<<"\n";
// cin>>len;

 return 0;
}