#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
  int n;
  cin >> n;
  int u;
  for(int i=0;i<n-1;i++){
    cout << "R" << endl;
    cin >> u;
    cout << "U" << endl;
    cin >> u;
  }
  if(u==1)return 0;
  cout << "R" << endl;
  cin >> u;
  if(u==1)return 0;
  cout << "U" << endl;
}