#include<bits/stdc++.h>
using namespace std;
int main(){
   string s;
   int c=0,n;
   cin>>n;
   for(int i=0;i<n;i++){
       cin>>s;
       if(s[0]>='A'&&s[0]<='G') c++;
       else if(s[0]>='R'&&s[0]<='T') c++; 
            
        
   }
   cout<<n-c;
    return 0;
}
/**************************************************************
	Problem: 1181
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/