#include <bits/stdc++.h>
using namespace std;
const int N = 53;
int b[N];
int main() {
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        string op;
        cin>>op;  
        //字符 D 代表方片，字符 C 代表草花，字符 H 代表红桃，字符 S 代表黑桃
        char x = op[0];
        char num = op[1];
        int pos = 0;
        switch(x){
            case 'D':
                pos = 0;
                break;
            case 'C':
                pos = 13;
                break;
            case 'H':
                pos = 26;
                break;
            case 'S':
                pos = 39;
                break;
        }
        if (num <= '9' && num >= '0') pos += num - '0';
        else if(num=='T')
            pos +=  10;
            else if (num=='J')
                pos +=  11;
                else if(num=='Q')
                    pos +=  12;
                    else if(num=='K')
                        pos +=  13;
                        else if(num=='A')
                            pos += 1;
                    b[pos]++;
    }
    int cnt = 0;
    for (int i = 1; i <= 52;i++)
        if (b[i]) cnt++;

    cout << 52 - cnt << endl;
    return 0;
}