x=int(input())
n=x
step=0
ar=[[0 for i in range(x)] for j in range(x)]
inp=input().split()
istart=int(inp[0])
jstart=int(inp[1])
iend=int(inp[2])
jend=int(inp[3])
ans=""




def UL():
	global ans
	global istart
	global jstart
	global step
	if(jstart>0 and istart>1):
		jstart=jstart-1
		istart=istart-2
		step=step+1
		ans=ans+"UL "

def UR():
	global ans
	global istart
	global jstart
	global step
	if(jstart<(n-1) and istart>1):
		istart=istart-2
		jstart=jstart+1
		step=step+1
		ans=ans+"UR "


def LL():
	global ans
	global istart
	global jstart
	global step
	if(jstart>0 and istart<(n-2)):
		istart=istart+2
		jstart=jstart-1
		step=step+1
		ans=ans+"LL "


def LR():
	global istart
	global jstart
	global step
	global ans
	if(jstart<(n-1) and istart<(n-2)):
		jstart=jstart+1
		istart=istart+2
		step=step+1
		ans=ans+"LR "

def L():
	global istart
	global jstart
	global step
	global ans
	if(jstart>1):
		step=step+1
		jstart=jstart-2
		ans=ans+"L "

def R():
	global ans 
	global istart
	global jstart
	global step
	if(jstart<(n-2)):
		step=step+1
		jstart=jstart+2
		ans=ans+"R "
def move():
	if(istart!=iend and jstart!=jend):
		if(istart>iend and jstart>jend):
			UL()
		elif(jstart>jend and istart<iend):
			LL()
		elif(jstart<jend and istart>iend):
			UR()
		elif(istart<iend and jstart<jend):
			LR()
	elif(istart==iend):
		if((abs(jstart - jend)%2)==0):
			if(jstart>jend):
				L()
			else:
				R()
		else:
			print("Impossible")
	




while(istart!=iend and jstart!=jend):
	move()

if(istart==iend):
	move()
elif(iend==jend):
	print("Impossible")

if(istart==iend and jstart==jend):
	print(ans)
	print(step)
else:
	print("Impossible")