#include<stdio.h>
#include<string.h>
int n,i,a,b,c,d,e,ans,len,count,count1,count2,count3;
char name[1000];
int main()
{
    scanf("%d",&n);
    scanf("%s",name);
    for(i=0;i<n;i++)
    {
        a=(int)name[i];
        if(a>=48 && a<=57)
        {
            count++;
        }
        else if(a>=65 && a<=90)
        {
            count1++;
        }
        else if(a>=97 && a<=122)
        {
            count2++;
        }
        else if(name[i]=='!'||name[i]=='@'||name[i]=='#'||name[i]=='$'||name[i]=='%'||name[i]=='^'||name[i]=='&'||name[i]=='*'||name[i]=='('||name[i]==')'||name[i]=='-'||name[i]=='+')
        {
            count3++;
        }
    }
    if(count==0)
    {
        b=1;
    }
    if(count1==0)
    {
        c=1;
    }
     if(count2==0)
    {
        d=1;
    }
     if(count3==0)
    {
        e=1;
    }
    if(n>=6)
    {
        printf("%d",b+c+d+e);
    }
    else 
    {
        ans=b+c+d+e;
        len=6-n;
        if(ans>len)
        {
            printf("%d",ans);
        }
        else 
        {
            printf("%d",len);
        }
    }
}