#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,i;
    cin>>n;
    char ch[n];
    cin>>ch;
    int num=0,upp=0,low=0,sp=0;
    for(i=0; i<n; i++)
    {
        if(ch[i]>=48 && ch[i]<=58)
            num++;
        if(ch[i]>=65 && ch[i]<=90)
            upp++;
        if(ch[i]>=97 && ch[i]<=122)
            low++;
        if(ch[i]=='!' || ch[i]=='@' || ch[i]=='#' || ch[i]=='$' || ch[i]=='%' || ch[i]=='^' || ch[i]=='&' || ch[i]=='*' || ch[i]=='(' || ch[i]==')' || ch[i]=='+' || ch[i]=='-' )
            sp++;
    }
    int add=0;
    if(num==0)
        add++;
    if(upp==0)
        add++;
    if(low==0)
        add++;
    if(sp==0)
        add++;
    if(n<6)
    {
        if((n+add)<6)
        {
            add=add+(6-(n+add));
        }
    }
    cout<<add<<endl;
    return 0;
}