#include "bits/stdc++.h"
using namespace std;
#define  rep(i, s, t) for (auto i=s; i != t; ++i)
#define rrep(i, s, t) for (auto i=t; i-- != s;)

int main() {
  int n, v;
  cin >> n;

  rep(i,0,n) {
    cout << 'D' << endl;
    cin >> v;
    if (v)
      return 0;
  }
  rep(j,0,n) {
    cout << 'R' << endl;
    cin >> v;
    if (v)
      return 0;
  }

  cout << 'U' << endl;
  cin >> v;
  if (v)
    return 0;
  cout << 'R' << endl;
  cin >> v;
  if (v)
    return 0;
  cout << 'R' << endl;
  cin >> v;
  if (v)
    return 0;
  cout << 'D' << endl;
  cin >> v;
  if (v)
    return 0;

  while (v == 0) {
    cout << 'R' << endl;
    cin >> v;
  }
}