#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: chenyaohuo
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/