#include <fstream>
#define nmax 1000005
using namespace std;
ifstream cin("robot3.in");
ofstream cout("robot3.out");
int p,t,a[10],k=0,nrc,n,dd,ds;
char dir,cif;
int main()
{
    cin>>t;
    if(t==1)
    {
        do
        {
            cin>>dir;
            if(dir=='A')
                k++;
        }while(dir!='T');
        cout<<k;
    }
    else
    {
        if(t==2)
        {
            nrc=0;
            do
            {
                cin>>dir;
                if(dir=='D')
                   {
                     cin>>p;
                    nrc=(nrc+p)%10;
                   }
                if(dir=='S')
                {
                    cin>>p;
                    nrc=(nrc-p+10)%10;
                }
                if(dir=='A')
                    cout<<nrc;
            }while(dir!='T');
        }
        else
        {
            if(t==3)
            {
                nrc=0;
                while(cin>>cif)
                {
                    int x=cif-'0';
                    dd=(x-nrc+10)%10;
                    ds=(nrc-x+10)%10;
                    if(dd==0 ||ds==0)
                    {
                        cout<<"A";
                    }
                    else
                    if(dd<=ds)
                    {
                        cout<<"D"<<dd<<"A";
                    }
                    else
                    {
                        cout<<"S"<<ds<<"A";
                    }
                    nrc=x;
                }
                cout<<"T";

            }
        }
    }

    return 0;
}