#include<bits/stdc++.h>
using namespace std;
int c[4][13];
int main(){
	int N;
	cin>>N;
	int a=0;
	for(int i=0;i<N;i++){
		int x1,x2;
		char xa,xb;
		cin>>xa>>xb;
		if(xb>='2' && xb<='9'){
			x2=xb-'0';
		}
		if(xb=='T') x2=10;
		if(xb=='A') x2=1;
		if(xb=='J') x2=11;
		if(xb=='k') x2=12;
		if(xb=='Q') x2=13;
		if(xa=='D') x1=1;
		if(xa=='C') x1=2;
		if(xa=='H') x1=3;
		if(xa=='S') x1=4;
		c[x1-1][x2-1]++;
	}
	for(int i=0;i<4;i++){
		for(int j=0;j<13;j++){
			if(c[i][j]==0) a++;
		}
	}
	cout<<a<<"\n";
	return 0;
}