Numero del vampiro

def test(a, b, c, d, n):
    z1=a*10+b
    z2=c*10+d
    if(z1*z2 == n):
        print(z1, z2, n)

for n in range(1000, 10000):
    x=n
    u=x%10; x//=10
    d=x%10; x//=10
    c=x%10; x//=10
    m=x

    test(m, c, d, u, n)  # 12 test
    ...
    ...