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

string h="!@#$%^&*()-+";
bool any(char c)
{
    for(int i=0;i<h.size();i++)
        if(c==h[i])return true;
    return false;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    string s;
    cin>>n>>s;
    int H[6]={};
    
    for(int i=0;i<n;i++)
    {
        if(s[i]<='9' && s[i] >='0')
            H[0]++;
      
            if(s[i] <='z' && s[i] >='a')
                H[1]++;
       
            if(s[i] <='Z' && s[i] >='A')
                H[2]++;
       
            
            if(any(s[i]))
                H[3]++;
        
    }
    int counter=0;
    for(int i=0;i<4;i++)
        if(!H[i])
            counter++;
    while(counter+s.size() < 6)counter++;
    cout<<counter;
    return 0;
}