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


int main() {
   int n;
    string str;
    cin>>n;
    if(n==0)
    {
        cout<<"6";
        return 0;
    }
    
    int a[4]={0,0,0,0},l=0,i;
    cin>>str;
    for(i=0;str[i]!='\0';i++)
    {
        if(str[i]>='0'&&str[i]<='9')
            a[0]++;
        else if(str[i]>='a'&&str[i]<='z')
               a[1]++;
        else if(str[i]>='A'&&str[i]<='Z')
                a[2]++;
        else if(str[i]=='!'||str[i]=='@'||str[i]=='#'||str[i]=='$'||str[i]=='%'||str[i]=='^'||str[i]=='&'||str[i]=='*'||str[i]=='('||str[i]=='-'||str[i]=='+'||str[i]==')')
                a[3]++;
    }
    
  //  cout<<a[0]<<a[1]<<a[2]<<a[3];
    if(a[0]==0)
        l++;
    if(a[1]==0)
        l++;
    if(a[2]==0)
        l++;
    if(a[3]==0)
        l++;
    if(n+l<6)
        l+=(6-(n+l));
    
    cout<<l;
        
    return 0;
}