#include<bits/stdc++.h>
using namespace std;
int ans=52,m,n,k,l;
string s,c;
int main(){
	cin>>m;
	for(int i=1;i<=m;i++){
		cin>>s;
		if(s[0]=='D'){
			k=1;
		}else if(s[0]=='C'){
			k=2;
		}else if(s[0]=='H'){
			k=3;
		}else{
			k=0;
		}
		if(c.find(char(s[1]-50+k*35))>0){
			continue;
		}else{
			c[i]=char(s[1]-50+k*35);
			ans--;
		}
		cout<<ans;
	}
}
/**************************************************************
	Problem: 2409
	User: zhengzihao
	Language: C++
	Result: Wrong Answer
****************************************************************/