#include<stdio.h>
#include<algorithm>
using namespace std;

int n,v;
char c;
bool m,M,e,num;

int main()
{
    scanf("%d",&n);

    for(int i=0; i<n; i++){
        scanf(" %c",&c);
        if(c>='0' && c<='9') num=true;
        if(c>='a' && c<='z') m=true;
        if(c>='A' && c<='Z') M=true;
        if(c=='!' || c=='@' || c=='#' || c=='$' || c=='%' || c=='^' || c=='&' || c=='*' || c=='(' || c==')' || c=='-' || c=='+') e=true;
    }
    if(m) v++;
    if(M) v++;
    if(e) v++;
    if(num) v++;

    printf("%d",max(6-n,4-v));
    return 0;
}