import java.io.PrintStream; import java.io.PrintWriter; import java.util.Scanner; public class Main_yukicoder331 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); Printer pr = new Printer(System.out); int ph = 0; while (true) { String s = sc.nextLine(); if (s.equals("Merry Christmas!")) { break; } int f = Integer.parseInt(s); // pr.printf("f ph prev d %d %d %d %d\n", f, ph, prev, d); if (f == 20151224) { pr.println("F"); pr.flush(); ph = 99; continue; } if (ph == 0) { if (f == 0) { ph = 1; pr.println("R"); pr.flush(); } else { pr.println("F"); pr.flush(); } } else if (ph == 1) { pr.println("L"); pr.flush(); ph = 2; } else if (ph == 2) { if (f == 0) { pr.println("R"); pr.flush(); ph = 3; } else { pr.println("F"); pr.flush(); ph = 1; } } else if (ph == 3) { if (f == 0) { pr.println("R"); pr.flush(); ph = 1; } else { pr.println("F"); pr.flush(); ph = 1; } } else { pr.println("F"); pr.flush(); } } pr.close(); sc.close(); } /* @SuppressWarnings("unused") private static class Scanner { BufferedReader br; Iterator it; Scanner (InputStream in) { br = new BufferedReader(new InputStreamReader(in)); } String next() throws RuntimeException { try { if (it == null || !it.hasNext()) { it = Arrays.asList(br.readLine().split(" ")).iterator(); } return it.next(); } catch (IOException e) { throw new IllegalStateException(); } } int nextInt() throws RuntimeException { return Integer.parseInt(next()); } long nextLong() throws RuntimeException { return Long.parseLong(next()); } float nextFloat() throws RuntimeException { return Float.parseFloat(next()); } double nextDouble() throws RuntimeException { return Double.parseDouble(next()); } void close() { try { br.close(); } catch (IOException e) { // throw new IllegalStateException(); } } } */ private static class Printer extends PrintWriter { Printer(PrintStream out) { super(out); } } }