#include <cstdio>
#include <cstdlib>
using namespace std;

int dd[] = {0, -1, 0, 1, 0};
int val[50][50][4];
bool vis[50][50];

void output(char c){
	putchar(c);
	putchar('\n');
	fflush(stdout);
}

int input(){
	int s;
	if(scanf("%d", &s) == 0){ exit(0); }
	if(s > 100){
		do{
			output('F');
		} while(scanf("%d", &s) > 0);
		exit(0);
	}
	return s;
}

void dfs(int y, int x, int d){
	vis[y][x] = true;
	val[y][x][d] = input();

	for(int i = 0; i < 3; ++i){
		output('L');
		d = (d + 1) & 3;
		val[y][x][d] = input();
	}
	for(int i = 0; i < 4; ++i){
		int ny = y + dd[d], nx = x + dd[d + 1];
		if(val[y][x][d] != 0 && !vis[ny][nx]){
			output('F');
			dfs(ny, nx, d);
			output('R');
		}
		else{
			output('L');
		}
		input();
		d = (d + 1) & 3;
	}
	output('R');
	input();
	output('F');
	input();
}

int main(){
	for(int i = 0; i < 50; ++i)
	for(int j = 0; j < 50; ++j)
	for(int k = 0; k < 4; ++k){
		val[i][j][k] = -1;
	}
	
	dfs(25, 25, 0);
}