#include <iostream>
using namespace std;
int main()
{
  int N;
  cin >> N;
  for (int i = 0; i < 2*N; i++)
  {
    if (i % 2 == 1)
    {
      cout << 'D' << endl;
    }
    else
    {
      cout << 'R' << endl;
    }
    int v;
    cin >> v;
    if (v)
    {
      break;
    }
  }
  return 0;
}
/*
  File : ~/yukicoder/530/F.cpp
  Date : 2025/03/21
  Time : 22:26:08
*/