#include <stdio.h>
#include<string.h>
#define MAX_SIZE 100 // Maximum string size


int main()
{  int k=0;
 int t=0;
 int n;
    char str[MAX_SIZE];
    int alphabets, digits, others,alphabet2, i;

  alphabet2= alphabets = digits = others = i = 0;

   scanf("%d",&n);
    scanf("%s",str);


    while(str[i]!='\0')
    {
        if(str[i]>='a' && str[i]<='z') 
        {
            alphabets++;
        }
        else if(str[i]>='A' && str[i]<='Z')
           {
               alphabet2++;
               
               
               
           }
        else if(str[i]>='0' && str[i]<='9')
        {
            digits++;
        }
        else
        {
            others++;
        }

        i++;
    }


  if(others==0)
k++;
if(alphabets==0)
 k++;
 if(alphabet2==0)
 k++;
 if(digits==0)
 k++;
 

 t=alphabets+alphabet2+k+digits+others;
 if(t<6)
{i=6-t;
k=k+i;
}
printf("%d",k);


  

    return 0;
}