# Author: Steven Carr
# Last Edited: October 2021

import stdio
import sys
# User input
n = int(sys.argv[1])
# Set dragon and nogard to F for one unit forward
dragon = 'F'
nogard = 'F'
# For an integer in the range of 1 to n,
# go n - 1 followed by an L, followed by another n - 1
# in reverse order, replacing L with R, and so on
for i in range(1, n+1):
    temp = dragon
    dragon = dragon + 'L' + nogard
    nogard = temp + 'R' + nogard
# Output the path of the dragon curve to the
# n number
stdio.writeln(dragon)