#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main() {
   int n,a,b,c,d,i,j,k,x=0;
   char s[1000000];
    scanf("%d",&n);
   scanf("%s",s);
       a=0;
       b=0;
       c=0;
       d=0;
       for(i=0;s[i]!='\0';i++)
       {
           if(s[i]>=97 &&s[i]<=122)
               a=1;          //!@#$%^&*()-+
           if(s[i]>=65 && s[i]<=90)
               b=1;
           if(s[i]>=48 && s[i]<=57)
               c=1;
           if(s[i]=='!' || s[i]=='@' || s[i]=='#' || s[i]=='$' || s[i]=='%' || s[i]=='^' || s[i]=='&' || s[i]=='*' || s[i]=='(' || 
             s[i]==')' || s[i]=='-' || s[i]=='+')
              d=1;
       }
       if(a!=1)
           x++;
       if(b!=1)
           x++;
       if(c!=1)
           x++;
       if(d!=1)
           x++;
       if(strlen(s)+x<6)
          printf("%d",6-strlen(s));
    else
        printf("%d",x);
    return 0;
}