#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string pass) {
    int i=0;
    int val1=0,val2=0,val3=0,val4=0;
    for(i=0;i<pass.length();i++)
    {
        if(pass[i]>=65&&pass[i]<=90)
        {
            val1++;
            break;
        }
    }
    for(i=0;i<pass.length();i++)
    {
        if (pass[i]>=97&&pass[i]<=122)
        {
            val2++;
            break;
        }
    }
    for(i=0;i<pass.length();i++)
    {
        if (pass[i]>=48&&pass[i]<=57)
        {
            val3++;
            break;
        }
    }
    for(i=0;i<pass.length();i++)
    {
        if (pass[i]=='!'||pass[i]=='@'||pass[i]=='#'||pass[i]=='$'||pass[i]=='%'||pass[i]=='^'||pass[i]=='&'||pass[i]=='+'||pass[i]=='*'||pass[i]=='('||pass[i]==')'||pass[i]=='-')
        {
            val4++;
            break;
        }
    }
    int res=0;
    if(val1==0)
    {
        res++;
    }
      if(val2==0)
    {
        res++;
    }
      if(val3==0)
    {
        res++;
    }
      if(val4==0)
    {
        res++;
    }
    if(res+pass.length()>=6)
    {
        return res;
    }
    else
    {
        int r=res+pass.length();
        int r1=6-r;
        return r1+res;
    }
    // Return the minimum number of characters to make the password strong
}
int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}