#include<bits/stdc++.h>
using namespace std;
#define rep(i,N) for(i=0;i<N;i++)
#define ll long long

int main(void){
    ll N;

    ll i,j,k;

    cin>>N;

    rep(i,2*N){
        if(i%2)cout<<"D"<<endl;
        else cout<<"R"<<endl;
        bool goal;
        cin>>goal;
        if(goal) return 0;
    }

    return 0;
}