import itertools
da=[]
for i in range(4):
    da.append(list(map(int,input().split())))

def f(a,b,c):
    if (a[1]-b[1])*(c[0]-b[0]) == (c[1]-b[1])*(a[0]-b[0]):
        return True
    return False

if f(da[0],da[1],da[2]) and f(da[1],da[2],da[3]):
    print('NO')
    exit()

for dat in itertools.permutations(da):
    l = []
    for i in range(4):
        a = (dat[i][0] - dat[(i+1)%4][0])**2 + (dat[i][1] - dat[(i+1)%4][1])**2
        l.append(a)
    a,b,c,d = l
    e = (dat[0][0] - dat[2][0])**2 + (dat[0][1] - dat[2][1])**2
    f = (dat[1][0] - dat[3][0])**2 + (dat[1][1] - dat[3][1])**2
    if e*f-a*c-b*d >= 0 and (e*f-a*c-b*d )**2 == 4*a*b*c*d:
        print('YES')
        exit()
print('NO')