import std.algorithm, std.conv, std.range, std.stdio, std.string;

void main()
{
  int r;

  auto rs = readln.chomp.to!int;
  foreach (i; 0..rs) r = ask("F");

  for (;;) {
    if (r == 0) {
      r = ask("R");
      continue;
    }

    ask("F");
    r = ask("L");
  }
}

int ask(string c)
{
  import core.stdc.stdlib;
  writeln(c); stdout.flush();
  auto s = readln.chomp;
  if (s == "Merry Christmas!") exit(0);
  auto r = s.to!int;
  if (r == 20151224) ask("F");
  return r;
}