#include <iostream>
#include <unordered_map>

using namespace std;

int a[100];
unordered_map <char, int> point{
    {'A', 1},
    {'2', 2},
    {'3', 3},
    {'4', 4},
    {'5', 5},
    {'6', 6},
    {'7', 7},
    {'8', 8},
    {'9', 9},
    {'T', 10},
    {'J', 11},
    {'Q', 12},
    {'K', 13}
};
unordered_map <char, int> color{
    {'D', 1},
    {'C', 3},
    {'H', 5},
    {'S', 7}
};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n;
    cin >> n;

    int res = 52;
    for(int i = 0; i < n; i++){
        char op1, op2;
        cin >> op1 >> op2;
        int x = color[op1], y = point[op2];
        a[x * 10 + y] ++;
        if(a[x * 10 + y] < 2) res --;
    }

    cout << res << endl;

    return 0;
}