#include<bits/stdc++.h>
using namespace std;
bool d[14],c[14],h[14],s[14];
int main(){
    char a[2];
    int m=52,n;
    cin>>n;
    for (int i=0;i<n;i++){
    	cin>>a;
    	if (a[0]=='D'){
    		if (a[1]=='A') d[1]=1;
			else if (a[1]=='2') d[2]=1;
			else if (a[1]=='3') d[3]=1;
			else if (a[1]=='4') d[4]=1;
			else if (a[1]=='5') d[5]=1;
			else if (a[1]=='6') d[6]=1;
			else if (a[1]=='7') d[7]=1;
			else if (a[1]=='8') d[8]=1;
			else if (a[1]=='9') d[9]=1;
			else if (a[1]=='T') d[10]=1;
			else if (a[1]=='J') d[11]=1;
			else if (a[1]=='Q') d[12]=1;
			else if (a[1]=='K') d[13]=1;
		}
		else if (a[0]=='C'){
    		if (a[1]=='A') c[1]=1;
			else if (a[1]=='2') c[2]=1;
			else if (a[1]=='3') c[3]=1;
			else if (a[1]=='4') c[4]=1;
			else if (a[1]=='5') c[5]=1;
			else if (a[1]=='6') c[6]=1;
			else if (a[1]=='7') c[7]=1;
			else if (a[1]=='8') c[8]=1;
			else if (a[1]=='9') c[9]=1;
			else if (a[1]=='T') c[10]=1;
			else if (a[1]=='J') c[11]=1;
			else if (a[1]=='Q') c[12]=1;
			else if (a[1]=='K') c[13]=1;
		}
		else if (a[0]=='H'){
    		if (a[1]=='A') h[1]=1;
			else if (a[1]=='2') h[2]=1;
			else if (a[1]=='3') h[3]=1;
			else if (a[1]=='4') h[4]=1;
			else if (a[1]=='5') h[5]=1;
			else if (a[1]=='6') h[6]=1;
			else if (a[1]=='7') h[7]=1;
			else if (a[1]=='8') h[8]=1;
			else if (a[1]=='9') h[9]=1;
			else if (a[1]=='T') h[10]=1;
			else if (a[1]=='J') h[11]=1;
			else if (a[1]=='Q') h[12]=1;
			else if (a[1]=='K') h[13]=1;
		}
		else if (a[0]=='S'){
    		if (a[1]=='A') s[1]=1;
			else if (a[1]=='2') s[2]=1;
			else if (a[1]=='3') s[3]=1;
			else if (a[1]=='4') s[4]=1;
			else if (a[1]=='5') s[5]=1;
			else if (a[1]=='6') s[6]=1;
			else if (a[1]=='7') s[7]=1;
			else if (a[1]=='8') s[8]=1;
			else if (a[1]=='9') s[9]=1;
			else if (a[1]=='T') s[10]=1;
			else if (a[1]=='J') s[11]=1;
			else if (a[1]=='Q') s[12]=1;
			else if (a[1]=='K') s[13]=1;
		}
	}
	for (int i=1;i<=13;i++){
		if (d[i]==1) m--;
		if (c[i]==1) m--;
		if (h[i]==1) m--;
		if (s[i]==1) m--;
	}
	cout<<m;
	return 0;
}