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

dbx = bx - ax
dby = by - ay
dcx = cx - bx
dcy = cy - by
if dbx * dcy == dby * dcx:
    print("NO")
    exit()

eps = 1e-8
for _ in range(3):
    ab = ((ax - bx) ** 2 + (ay - by) ** 2) ** 0.5
    bc = ((bx - cx) ** 2 + (by - cy) ** 2) ** 0.5
    cd = ((cx - dx) ** 2 + (cy - dy) ** 2) ** 0.5
    da = ((dx - ax) ** 2 + (dy - ay) ** 2) ** 0.5
    ac = ((ax - cx) ** 2 + (ay - cy) ** 2) ** 0.5
    bd = ((bx - dx) ** 2 + (by - dy) ** 2) ** 0.5

    if abs(ac * bd - (da * bc + ab * cd)) < eps:
        print("YES")
        exit()

    bx, cx, dx = cx, dx, bx
    by, cy, dy = cy, dy, by

print("NO")