#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    int n; cin >> n;
    int v = 0, t = 1;
    while (v == 0) {
        if (t & 1) cout << "D" << endl;
        else cout << "R" << endl;
        cin >> v;
        t++;
    }
    return 0;
}