#include<bits/stdc++.h>
using namespace std;
int main()
{int n;string s;
    cin>>n;

        cin>>s;
        int l=s.length();
        int vl=6-l;int lr=0;int f1=0,f2=0,f3=0,f4=0;
        for(int h=0;h<l;h++)
        {
            if((s[h]>='a'&&s[h]<='z')&&f1==0)
            {
                lr++;;f1=1;
            }
            if((s[h]>='A'&&s[h]<='Z')&&f2==0)
            {
                lr++;f2=1;
            }
            if((s[h]=='!'||s[h]=='@'||s[h]=='#'||s[h]=='$'||s[h]=='%'||s[h]=='^'||s[h]=='&'||s[h]=='-'||s[h]==')'||s[h]=='('||s[h]=='+'||s[h]=='*')&&f3==0)
            {f3=1;
                lr++;
            }
            if((s[h]>='0'&&s[h]<='9')&&f4==0)
            {f4=1;
                lr++;
            }
        }int ans=0;
        if(l>6){
         ans=4-lr;//cout<<'b';
         cout<<ans<<endl;}
        else
        {
           // cout<<4-lr<<endl;;
            l=l+(4-lr);
            if(l>=6)
            {//cout<<'a';
                cout<<4-lr<<endl;
            }
            else
            {
                cout<<4-lr+(6-l)<<endl;
            }
        }
    }