#誤解法２
I,R,O=input,range,print
N=int(I())
A=[list(map(int,I().split()))for i in R(3)]
d=[1,-1][A[0][0]<A[2][0]]
O(N)
y=A[0][1]
for x in R(1,N+1):
	v=[x,y]
	if v in A[:2]:O(x,y+d)
	elif v==A[2]:O(x,y-d)
	else:O(x,y)