include[HTML_REMOVED]

using namespace std;
char x,y; 
int n,a[5][55],s,sum;
int main(){
    cin>>n;
    while(n--)
    {
        cin>>x>>y;
        s=y-'0';
        if(y=='A') s=1;
        if(y=='T') s=10;
        if(y=='J') s=11;
        if(y=='Q') s=12;
        if(y=='K') s=13;
        if(x=='D') a[1][s]=1;
        if(x=='C') a[2][s]=1;
        if(x=='H') a[3][s]=1;
        if(x=='S') a[4][s]=1;
    }  
    for(int i=1;i<=4;i++)
        for(int j=1;j<=52;j++)
            sum+=a[i][j];
    cout<<52-sum;
    return 0;
}