#include<bits/stdc++.h>

using namespace std;

#include<atcoder/all>
using namespace atcoder;
using mint=atcoder::modint998244353;

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#define int long long

signed main(){
	int N;cin>>N;
	for(int i=0;i<2*N;i++){
		if(i%2==0)cout<<'D'<<endl;
		else cout<<'R'<<endl;
		int v;cin>>v;
		if(v==1)return 0;
	}
}