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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    long long int n,numbers=0,lower_case=0,upper_case=0,symbols=0,temp=0;
    cin >> n;
    string s;
    cin >> s;
    
    for(int i=0;i<n;i++)
    {
        if(s[i]>='0'&&s[i]<='9')
            numbers++;
        else if(s[i]>='a'&&s[i]<='z')
            lower_case++;
        else if(s[i]>='A'&&s[i]<='Z')
            upper_case++;
        else 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]=='+')
            symbols++;
            
    }
        
    if(numbers==0)
        temp++;
    if(lower_case==0)
        temp++;
    if(upper_case==0)
        temp++;
    if(symbols==0)
        temp++;
    n=n+temp;
    if(n<6)
        temp+=(6-n);
    cout<<temp;
    return 0;
}