#include <bits/stdc++.h>
using namespace std;
int use[50][50];
//25,25位からスタート。0:未訪問,1:訪問済み,2:壁
int x=25,y=25;
int direction=0;//0:上,1:右,2:下,3:左
int dx[]={0,1,0,-1},dy[]={1,0,-1,0};
bool turn_right(){
	int d=(direction+1)%4;
	//cout<<"check:"<<x+dx[d]<<","<<y+dy[d]<<":"<<use[y+dy[d]][x+dx[d]]<<endl;
	if(use[y+dy[d]][x+dx[d]]==0)	return true;
	return false;
}
int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	while(true){
		string s;	cin>>s;
		if(s=="Merry Christmas!")	return 0;
		int n=stoi(s);
		if(n==0)	break;
		else 	cout<<"F"<<endl;
	}
	bool first=false;
	while(true){
		use[y][x]=1;
		//cout<<"direction:"<<direction<<endl;
		//cout<<"condition:"<<use[y+dy[direction]][x+dx[direction]]<<endl;
		int n=0;
		if(first){
			string s;	cin>>s;
			if(s=="Merry Christmas!")	return 0;
			n=stoi(s);
		}
		first=true;
		if(n==20151224)	cout<<"F"<<endl;//これで終了
		else{
			//cout<<"cur:"<<x<<","<<y<<endl;
			//cout<<"wall:"<<x+dx[direction]*(n+1)<<","<<y+dy[direction]*(n+1)<<endl;
			use[y+dy[direction]*(n+1)][x+dx[direction]*(n+1)]=2;
			if(turn_right()){
				cout<<"R"<<endl;
				(direction+=1)%=4;
			}
			else if(n==0){
				cout<<"L"<<endl;
				(direction+=3)%=4;
			}
			else if(use[y+dy[direction]][x+dx[direction]]!=2){
				cout<<"F"<<endl;
				x+=dx[direction];	y+=dy[direction];
			}
			else{
				cout<<"L"<<endl;
				(direction+=3)%=4;
			}
		}
	}
}