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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int n;
    string s;
    cin>>n;
    cin>>s;
    int i;
    int lower=0,upper=0,number=0,special=0;
    for(i=0;i<n;i++)
    {
        if(s[i]>='a' && s[i]<='z')
        {
            lower=1;
        }
        if(s[i]>='A' && s[i]<='Z')
        {
            upper=1;
        }
        if(s[i]>='0' && s[i]<='9')
        {
            number=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]=='+' )
        {
            special=1;
        }
        
            
    }
    int count=0;
    if(number==0)
        count++;
    if(upper==0)
        count++;
    if(special==0)
        count++;
    if(lower==0)
        count++;
    int x=n+count;
    if(x<6)
    {
        int l=6-n;
        cout<<l<<endl;
    }
        //cout<<6<<endl;
    else
        cout<<count<<endl;
    return 0;
}