#include<bits/stdc++.h>
using namespace std; 
int main(){
    int n,c=0;
    cin>>n;
    string a;
    for(int i=1;i<=n;i++){
    	cin>>a;
 if(a[0]>='A'&&a[0]<='G') c++;
 if(a[0]>='R'&&a[0]<='T') c++;
    }
    cout<<n-c;

	
	return 0;
}

/**************************************************************
	Problem: 1181
	User: lidongcheng
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/