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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    cin>>n;
    string s;
    cin>>s;
    int l=0,d=0,u=0,sp=0;
    for(int i=0;i<s.length();i++)
    {
        if(s[i]>='0' && s[i]<= '9')
            d++;
        else if(islower(s[i]))
            l++;
        else if(isupper(s[i]))
            u++;
        else if(!isalnum(s[i]))
            sp++;
    }
    int c=0;
    if(d==0)
        c++;
    if(u==0)
        c++;
    if(l==0)
        c++;
    if(sp==0)
        c++;
    if(n>6)
        cout<<c;
    else
    {
        if((n+c)>6)
            cout<<c;
        else
            cout<<6-n;
    }
    return 0;
}