#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,i,c1=0,c2=0,c3=0,c4=0,add,add1;
    scanf("%d",&n);
    char temp[100];
    scanf("%s",temp);
    for(i=0;i<n;i++)
    {
        
        if((temp[i]>='a')&&(temp[i]<='z'))
           c1=1;
        else if((temp[i]>='A')&&(temp[i]<='Z'))
            c2=1;
        else if((temp[i]>='0')&&(temp[i]<='9'))
            c3=1;
            else if((temp[i]=='!')||(temp[i]=='@')||(temp[i]=='#')||(temp[i]=='$')||(temp[i]=='%')||(temp[i]=='^')||(temp[i]=='&')||(temp[i]=='*')||(temp[i]=='(')||(temp[i]==')')||(temp[i]=='-')||(temp[i]=='+'))
                c4 =1;
        
             
    }
     add = c1+c2+c3+c4;
        add = 4 - add;
        
        add1 = n + add;
        
        if(add1<6)
        {
            add = add + 6-add1;
           
        }
            printf("%d",add);    
    return 0;
}