#pragma GCC optimize("O3")
#include<bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=LLONG_MAX;
const int inf=INT_MAX;
const int nmax=1e5+5;
const int mod=1e9+7;
using namespace std;
int n,i,j,t,viz[5],ans;
string s,a[5];
int main()
{
    //freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	a[0]="!@#$%^&*()-+";
	a[1]="qwertyuiopasdfghjklzxcvbnm";
	a[2]="QWERTYUIOPLKJHGFDSAZXCVBNM";
	a[3]="0123456789";
	cin>>n>>s;
	for(i=0;i<s.size();i++)for(j=0;j<4;j++)for(t=0;t<a[j].size();t++)if(s[i]==a[j][t])viz[j]=1;
	for(i=0;i<4;i++)if(!viz[i])ans++;
	n+=ans;
	if(n<6)ans+=6-n;
	cout<<ans<<endl;
	return 0;
}