#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 */   
    int n,c1=0,c2=0,c3=0,c4=0,c5=0,a=0;
    cin>>n;
    char s[n];
    for(int i=0;i<n;i++)
        cin>>s[i];
    int j;
    //getline(cin,s);
    //int l=s.length();
        for(int i=0;i<n;i++)
        {
            if(s[i]>='a' && s[i]<='z')
                c3++;
            if(s[i]>='A' && s[i]<='Z')
                c4++;
            if(s[i]>='0' && s[i]<='9')
                c2++;
            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]=='+' )
                c5++;
        }
        if(c3>=1 && c2>=1 && c4>=1 && c5>=1)
            a=0;
        else
        {
        if(c3==0)
            a++;
        if(c4==0)
            a++;
        if(c2==0)
            a++;
        if(c5==0)
            a++;
        }
        
    
    if(a+n<6)
    {
        j=6-a-n;
        a=a+j;
    }
    cout<<a<<endl;
    return 0;
}