#! ruby
# yukicoder My Practice
# author: Leonardone @ NEETSDKASU
############################################################
def gs() gets.chomp end
def gi() gets.to_i end
def gf() gets.to_f end
def gss() gs.split end
def gis() gss.map(&:to_i) end
def gfs() gss.map(&:to_f) end
def nmapf(n,f) n.times.map{ __send__ f } end
def ngs(n) nmapf n,:gs end
def ngi(n) nmapf n,:gi end
def ngss(n) nmapf n,:gss end
def ngis(n) nmapf n,:gis end
def arr2d(h,w,v=0) h.times.map{[v] * w} end
def for2p(hr,wr,&pr) hr.each{|i|wr.each{|j| yield(i,j)}} end
def nsum(n) n * (n + 1) / 2 end
def vcount(d,r=Hash.new(0)) d.inject(r){|r,e| r[e]+=1;r} end
############################################################

=begin

最大でも20x20なんで
うまくやればTLEなんて起こらないはずなのに

壁伝いだと以下に気をつけるべき

ループに捕まると抜け出せない
##########
#.........
#..####..#
#.v#..#..#
#..####..#
#........#
##########

行き止まりも恐い
##########
#.#.......
#.#.######
#.#......#
#.#.######
#......v.#
##########

下手すると上下左右に単機ループがあるかもしれない
##########
#.........
#...#....#
#.#.v.#..#
#........#
#...#....#
#........#
##########

=end


UNKNOWN_CELL = 0
WALL_CELL = 1
SPACE_CELL = 2

f = arr2d(60, 60)
w = arr2d(60, 60)
x = 30
y = 30
dx = 1
dy = 0
f[y][x] = SPACE_CELL

def rotr(dx, dy) [-dy, dx] end
def rotl(dx, dy) [dy, -dx] end
def rcell(f, x, y, dx, dy)
    rx, ry = rotr(dx, dy)
    f[y + ry][x + rx]
end
def lcell(f, x, y, dx, dy)
    lx, ly = rotl(dx, dy)
    f[y + ly][x + lx]
end

t = 0

loop {
    s = STDIN.gets
    break if s[0] == "M"
    if s.size > 2
        STDOUT.puts "F"
    else
        if t > 100
            if t % 5 == 0
                puts "F"
            else
                puts "RF"[t % 2]
            end
        else
            if t % 5 == 0
                puts "F"
            else
                puts "LF"[t % 2]
            end
        end
        t = (t + 1) % 200
    end
    STDOUT.flush
}