#include <iostream>
using namespace std;

const string goal = "Merry Christmas!";

int main(){
  string s;
  while(getline(cin, s)){
    if(s == goal){
      break;
    }
    int n = atoi(s.c_str());
    if(n == 0){
      cout << "L" << endl;
      continue;
    }
    cout << "R" << endl;
    int m;
    cin >> m;
    if(m > 0){
      cout << "F" << endl;
    } else {
      cout << "L" << endl;
      cin >> m;
      cout << "F" << endl;
    }
  }
  return 0;
}