#include <iostream>
#include <string>
#include <vector>
using namespace std;
vector<pair<int,int>> v;
int calc(int x,int y){
  int ret=0;
  for(int i=0;i<v.size();++i){
    if(x==v[i].first && y==v[i].second){
      ret=1;
      break;
    }
  }
  return ret;
}
int main(){
  int x=0,y=0;
  v.push_back(make_pair(x,y));
  int f_i=0,f_w=0,mode=0,d=0,d_p=0;
  while(1){
    string s1,s2;getline(cin,s1);
    if(s1=="Merry Christmas!"){
      break;
    }
    if(s1=="20151224"){
      s2="F";
      cout<<s2<<endl;
      if(d==0) y-=1;
      if(d==1) x+=1;
      if(d==2) y+=1;
      if(d==3) x-=1;
      v.push_back(make_pair(x,y));
      continue;
    }
    int a=stoi(s1);
    if(f_i==0 && a!=0){
      s2="F";
      cout<<s2<<endl;
      if(d==0) y-=1;
      if(d==1) x+=1;
      if(d==2) y+=1;
      if(d==3) x-=1;
      v.push_back(make_pair(x,y));
      continue;
    } else if(f_i==0 && a==0){
      f_i=1;
    }
    if(calc(x,y)) mode=1;
    if(f_w==0 && a==0){
      if(mode==0){
        s2="R";
        if(d_p==0) d=1;
        if(d_p==1) d=2;
        if(d_p==2) d=3;
        if(d_p==3) d=0;
        d_p=d;
      } else {
        s2="L";
        if(d_p==0) d=3;
        if(d_p==1) d=0;
        if(d_p==2) d=1;
        if(d_p==3) d=2;
        d_p=d;
      }
      cout<<s2<<endl;
      f_w=1;
      continue;
    } else if(f_w==0 && a!=0){
      if(mode==0){
        s2="L";
        if(d_p==0) d=3;
        if(d_p==1) d=0;
        if(d_p==2) d=1;
        if(d_p==3) d=2;
        d_p=d;
      } else {
        s2="R";
        if(d_p==0) d=1;
        if(d_p==1) d=2;
        if(d_p==2) d=3;
        if(d_p==3) d=0;
        d_p=d;
      }
      cout<<s2<<endl;
      f_w=1;
      continue;
    } else if(f_w!=0 && a==0){
      if(mode==0){
        s2="R";
        if(d_p==0) d=1;
        if(d_p==1) d=2;
        if(d_p==2) d=3;
        if(d_p==3) d=0;
        d_p=d;
      } else {
        s2="L";
        if(d_p==0) d=3;
        if(d_p==1) d=0;
        if(d_p==2) d=1;
        if(d_p==3) d=2;
        d_p=d;
      }
      cout<<s2<<endl;
      continue;
    } else if(f_w!=0 && a!=0){
      s2="F";
      cout<<s2<<endl;
      if(d==0) y-=1;
      if(d==1) x+=1;
      if(d==2) y+=1;
      if(d==3) x-=1;
      v.push_back(make_pair(x,y));
      f_w=0;
      continue;
    }
  }
  return 0;
}