#include <bits/stdc++.h>
//#include <conio.h>
using namespace std;

int main(){
    
    
    int n;
    cin>>n;
    string s;
    cin>>s;
    int l=s.length();
    int lc=0,up=0,sp=0,dig=0;
    for(int i=0;i<l;i++)
    {
        if(s[i]>='a'&&s[i]<='z') lc=1;
        if(s[i]>='A'&&s[i]<='Z') up=1;
        if(s[i]=='!'||s[i]=='@'||s[i]=='#'||s[i]=='$'||s[i]=='%'||s[i]=='^'||s[i]=='&'||s[i]=='*'||s[i]=='('||s[i]==')'||s[i]=='-'||s[i]=='+') sp=1;
        if(s[i]>='0'&&s[i]<='9') dig=1;
    }
    int add=0;
    if(l>=6)
    {
       if(lc==0) add++;
       if(up==0) add++;
       if(sp==0) add++;
       if(dig==0) add++;
       
       cout<<add<<"\n";
    }
    
    else
    {
       
        if(lc==0){
            add++; l++;
        }
        if(up==0){
            add++; l++;
        }
        if(sp==0){
            add++;l++;
        }
        if(dig==0){
            add++; l++;
        }
        if(l<6)
        {
            cout<<(add+(6-l))<<"\n";
        }
        else{
            cout<<add<<"\n";
        }
        
        
    }
   // getch();
    return 0;
    
    
    
}