C++ :

#include<bits/stdc++.h>
using namespace std;
int n,ans;
string a;
int main()
{
//	freopen("1771.in","r",stdin);
//	freopen("1771.out","w",stdout);
	cin>>n;
	char s[10]={'A','B','C','D','E','F','G','R','S','T'};
	for(int i=1;i<=n;i++)
	{
		cin>>a;
		for(int j=0;j<10;j++)
			if(a[0]==s[j]) {ans++;break;}
	}
	cout<<n-ans;
		
	return 0;	
}