#include <bits/stdc++.h>

using namespace std;
bool a[4]={0};
int minimumNumber(int n, string s) {
   for(int i=0;i<s.length();i++)
   {
       if((s[i]-'0')>=0&&(s[i]-'0')<=9)
           a[0]=1;
       if(s[i]>=97&&s[i]<=122)
           a[1]=1;
      if(s[i]>=65&&s[i]<=90)
           a[2]=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]=='+')
       a[3]=1;
   }
    int m=6-n;int x=0;
    for(int i=0;i<4;i++)
    {
        if(a[i]==1)
            x++;
    }
    int y=4-x;
    int z=max(m,y);
        return z;
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}