#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
	int N;
	cin>>N;
	for(int i=0;i<2*N;i++){
		cout<<(i%2 ? 'D' : 'R')<<endl;
		int a;
		cin>>a;
		if(a == 1) return 0;
	}
}