#include<bits/stdc++.h>
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    
    int n,i,j;
    int sum=0;
    string str;
    cin>>n;
    cin>>str;
    int spcl=0,dig=0,caps=0,low=0;
    for(i=0;i<n;i++)
    {
        if(str.at(i)>='0' && str.at(i)<='9')
            dig=1;
        else if(str.at(i)>='A' && str.at(i)<='Z')
            caps=1;
        else if(str.at(i)>='a' && str.at(i)<='z')
            low=1;
        else
            spcl=1;
    }
    if(dig==0)
        sum++;
    if(caps==0)
        sum++;
    if(low==0)
        sum++;
    if(spcl==0)
        sum++;
    if(str.length()+sum<6)
        sum+=6-(str.length()+sum);
    cout<<sum;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}