#include<bits/stdc++.h>
#define ll long long
#define mod 1000000007
using namespace std;
//Global declarations
vector<ll> v;

//Global declarations DONE
int main()
{
/*#ifndef ONLINE_JUDGE
		freopen("inp.txt", "r", stdin);
#endif*/

//Variables to be used ;
ll i,n,t;


ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
//FAST INPUT DONE



cin>>n;

string s;
ll m;
cin>>s;
ll l=s.length();
ll up,lo,dig,sp,ans;
up=0;
lo=0;
dig=0;
sp=0;
ans=0;
for(i=0;i<l;i++)
{
    if(s[i]>=65 && s[i]<=90)
        up++;
    if(s[i]>=97 && s[i]<=122)
        lo++;
    if(s[i]>=48 && s[i]<=57)
        dig++;
    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]==')')
        sp++;



}
if(up==0)
    ans++;
if(lo==0)
    ans++;
if(dig==0)
    ans++;
if(sp==0)
    ans++;
m=0;

if((ans+n) <6)
cout<<(6-n)<<endl;
else
cout<<ans<<endl;

return 0;
}