n = int(input())
l = [int(t) for t in input().split()]
s,m = '',10**5
def sl(n,x,y,u,v,c,k):
	dp = [[-1]*n for i in range(n)]
	p = list(range(n))
	if c == 0 or x not in p or y not in p:
		return 10**5
	if dp[x][y] != -1:
		return dp[x][y]
	if x == u and y == v:
		global s,m
		if len(k.split()) < m:
			s = k
			m = len(k.split())
		return 0 
	dp[x][y] = min(1+sl(n,x-2,y-1,u,v,c-1,k+'UL '),1+sl(n,x-2,y+1,u,v,c-1,k+'UR '),1+sl(n,x,y+2,u,v,c-1,k+'R '),1+sl(n,x+2,y+1,u,v,c-1,k+'LR '),1+sl(n,x+2,y-1,u,v,c-1,k+'LL '),1+sl(n,x,y-2,u,v,c-1,k+'L '))
	return dp[x][y]

z = sl(n,l[0],l[1],l[2],l[3],n-2,'')
if s == '':
    print('Impossible')
else:
    print(z)
    print(s.strip())