#include <bits/stdc++.h>

using namespace std;



int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    string str=password;
    int flag1=0,flag2=0,flag3=0,flag4=0;
    for(int i=0;i<password.length();i++)
    {
        char ch=str[i];
        if(ch>=48 && ch<=57)
            flag3=1;
        if(ch>=97 && ch<=122)
            flag2=1;
        if(ch>=65 && ch<=90)
            flag1=1;
        if(ch>=33 && ch<=45)
            flag4=1;
    }
    int count=0,len=str.length();;
    if(flag1==0)
    {count++;len++;}
    if(flag2==0)
    {count++;len++;}
    if(flag3==0)
    {   count++;len++;}
    if(flag4==0)
    {count++;len++;}
    if(len<6)
        count+=6-len;
    cout<<count;
    return 0;
}