#include // #include using namespace std; // using namespace atcoder; #define rep(i, a, n) for(ll i = a; i < n; i++) #define rrep(i, a, n) for(int i = a; i >= n; i--) #define inr(l, x, r) (l <= x && x < r) #define ll long long #define ld long double // using mint = modint1000000007; // using mint = modint998244353; constexpr int IINF = 1001001001; constexpr ll INF = 1e18; template void chmax(t&a,u b){if(a void chmin(t&a,u b){if(b> n; rep(i, 0, 2*n){ if(i%2 == 0) cout << 'D' << endl; else cout << 'R' << endl; int r; cin >> r; if(r) break; } return 0; }