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


int main() {
    int n;
   cin>>n;
    
    string a;
    int b[4]={0},count=0;
    cin>>a;
    for(int i=0;a[i];i++)
    {
if(a[i]>=48&&a[i]<=57)
    b[0]=1;
       else if(a[i]>=65&&a[i]<=90)
    b[1]=1;
        else if(a[i]>=97&&a[i]<=122)
    b[2]=1;
        else if(a[i]=='!'||a[i]=='@'||a[i]=='#'||a[i]=='$'||a[i]=='%'||a[i]=='^'||a[i]=='&'||a[i]=='*'||a[i]=='('||a[i]==')'||a[i]=='-'||a[i]=='+')
    b[3]=1;
    
    
   }
    for(int i=0;i<4;i++)
    {
        if(b[i]==0)
            count++;
    }
    if((a.length()+count)<6)
        cout<<count+(6-(a.length()+count));
    else
        cout<<count;
        
    
    return 0;
}