from math import sqrt

ax,ay=map(int,input().split())
bx,by=map(int,input().split())
cx,cy=map(int,input().split())
dx,dy=map(int,input().split())

AB=sqrt((ax-bx)**2 + (ay-by)**2)
CD=sqrt((cx-dx)**2 + (cy-dy)**2)
AD=sqrt((ax-dx)**2 + (ay-dy)**2)
BC=sqrt((bx-cx)**2 + (by-cy)**2)
AC=sqrt((ax-cx)**2 + (ay-cy)**2)
BD=sqrt((bx-dx)**2 + (by-dy)**2)

for x,y,z,w in [(bx-ax,by-ay,cx-ax,cy-ay),(bx-ax,by-ay,dx-ax,dy-ay),(cx-ax,cy-ay,dx-ax,dy-ay),(cx-bx,cy-by,dx-bx,dy-by)]:
    if y*z==w*x:
        print("NO")
        exit()

eps=0.00000001

if abs(AB*CD+AD*BC - AC*BD)<=eps:
    print("YES")
elif abs(AC*BD+AD*BC - AB*CD)<=eps:
    print("YES")
elif abs(AB*CD+AC*BD - AD*BC)<=eps:
    print("YES")
else:
    print("NO")