I want to check if the user output is odd or even but it only accepts integer but when I run it will always show invalid even the use puts an integer

Question

a = (input("Enter a Whole Number: "))


if type(a)== int:
    if a % 2 == 0:
        print ("Even")
    elif b % 2 != 0:
        print ("odd")
else:
    print("Invalid")

I want the output will put an invalid if the user will put a non integer. Answer if it is a odd or even if the user put an integer