#include <bits/stdc++.h>
using namespace std;
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
template<class T1, class T2> inline bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); }
template<class T1, class T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
using ll = long long;

int parse(string s) {
	istringstream iss(s);
	int res;
	iss >> res;
	return res;
}

int input() {
	string s;
	cin >> s;
	return parse(s);
}

int y, x, d;
bool vis[1000][1000][4];
int dy[] = {0, 1, 0, -1};
int dx[] = {1, 0, -1, 0};

void mov(string s) {
	cout << s << endl;
	if (s == "F") {
		y += dy[d];
		x += dx[d];
	} else if (s == "L") {
		d = (d + 3) % 4;
	} else if (s == "R") {
		d = (d + 1) % 4;
	}
	vis[y][x][d] = true;
}

void bad(int k) {
	if (k >= 20151124) return;
	rep (i, 4) {
		vis[y + dy[d] * k][x + dx[d] * k][i] = true;
	}
}

bool rightvis() {
	int dd = (d + 1) % 4;
	return vis[y + dy[dd]][x + dx[dd]][dd];
}

bool canright() {
	if (rightvis()) return false;
	mov("R");
	int y = input();
	bad(y + 1);
	if (y == 0) {
		mov("L");
		int z = input();
		bad(z + 1);
		return false;
	} else {
		return true;
	}
}

int main() {
	y = 500; x = 500; d = 0;
	vis[y][x][0] = true;
	while (true) {
		string s;
		cin >> s;
		if (s == "Merry") break;
		int x = parse(s);
		bad(x + 1);
		if (x == 20151224) {
			mov("F");
		} else if (x > 0) {
			if (canright()) {
				mov("F");
			} else {
				mov("F");
			}
		} else {
			if (canright()) {
				mov("F");
			} else {
				mov("L");
			}
		}
	}
	string t;
	cin >> t;
	return 0;
}