#include <bits/stdc++.h>
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 << 'D' << endl;
        cin >> u;
    }
    if (u == 1)
    {
        return 0;
    }
    else
    {
        cout << 'R' << endl;
        cin >> u;
        if (u == 1)
        {
            return 0;
        }
        cout << 'D' << endl;
        cin >> u;
        if (u == 1)
        {
            return 0;
        }
    }
    return 0;
}