#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
inline ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
inline ll lcm(ll a, ll b) { return a / gcd(a, b)*b; }
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }

/*
 <url:https://yukicoder.me/problems/no/331>
 問題文============================================================
 =================================================================
 解説=============================================================
 ================================================================
 */


int main(void) {
    cin.tie(0); ios_base::sync_with_stdio(false);
    string input;
    while(cin>>input){ // 壁にぶつかるまで前進
        if(input == "Merry") return 0;
        if(input == "0") break;
        cout << "F" << endl;
    }
    cout << "L" << endl;
    int cnt = 0;
    while(cin >> input){// 右手法
        cnt++;
        if(input == "Merry") return 0;
        bool front = (input!="0");
        cout << "R" << endl;
        cin >> input;
        bool right = (input!="0");
        if(right){
            cout << "F" << endl;
        }else{
            cout << "L" << endl;
            cin >> input;
            if(front){
                cout << "F" << endl;
            }else{
                cout << "L" << endl;
                cin >> input;
                cout << "F" << endl;
            }
        }
        if(cnt % 100==0){ // noise
            int rotate = rand()%3;
            while(cin >> input){ // 適当に回転
                if(input == "Merry") return 0;
                if(rotate) break;
                rotate--;
                cout << "R" << endl;
            }
            while(cin>>input){ // 壁にぶつかるまで前進
                if(input == "Merry") return 0;
                if(input == "0") break;
                cout << "F" << endl;
            }
            cout << "L" << endl;
        }
    }
    return 0;
}