#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n;
    cin>>n;
    char s[100];
    scanf("%s",s);
    int l=0,u=0,sm=0,d=0;
    for(int i=0;i<n;i++)
    {
        if(s[i]>='a'&&s[i]<='z')
            l=1;
        else if(s[i]>='A'&&s[i]<='Z')
            u=1;
        else if(s[i]>='0'&&s[i]<='9')
            d=1;
        else 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]=='+')
            sm=1;
    }
    int c = 4-(sm+u+l+d);
    int tot = c+n;
    if(tot<6)
        cout<<c+(6-tot);
    else 
        cout<<c;
    return 0;
}