#include <bits/stdc++.h>

using namespace std;

void minimumNumber(int n, string password) {
string numbers = "0123456789",lower_case = "abcdefghijklmnopqrstuvwxyz",upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",special_characters = "!@#$%^&*()-+";
    int i,cnt=0,cn=0,val=0,b=0,j,ans;
    for(i=0;i<n;i++)
    {
        for(j=0;j<10;j++)
        {
        if(password[i]==numbers[j])
        {
            cnt++;
            break;
        }
        }
        if(cnt>0)
        {
            break;
        }
    }
      for(i=0;i<n;i++)
    {
        for(j=0;j<26;j++)
        {
        if(password[i]==lower_case[j])
        {
            cn++;
            break;
        }
        }
        if(cn>0)
        {
            break;
        }
    }
      for(i=0;i<n;i++)
    {
        for(j=0;j<26;j++)
        {
        if(password[i]==upper_case[j])
        {
            val++;
            break;
        }
        }
        if(val>0)
        {
            break;
        }
    }
      for(i=0;i<n;i++)
    {
        for(j=0;j<13;j++)
        {
        if(password[i]==special_characters[j])
        {
            b++;
            break;
        }
        }
        if(b>0)
        {
            break;
        }
    }
    ans=b+val+cn+cnt;
    if(n>5)
    {
    cout<<4-ans;
    }
    else if(n<4)
    {
        cout<<6-n;
    }
    else if(n==4)
    {
       if(ans>1) 
           cout<<"2";
       else
           cout<<"3";
    }
    else
    {
        if(ans>2)
            cout<<"1";
        else if(ans==1)
            cout<<"3";
        else
            cout<<"2";
    }
}
int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    minimumNumber(n, password);
    return 0;
}