if elif else

age = int(input("Enter your age: "))
if age >= 18:
    print ("You are over 18")
elif age <0:
    print ("you have not born yet")
elif age >=100:
    print("You are overaged")
else:
    print("you must be 18+ to sign up")
    
weight = float(input("enter your weight"))
Unit - input("Kilo or pounds? (K or L):")
if Unit == "K":
    weight = weight * 2.205
    unit ="Lbs"
    print (f"Your weight is: {weight}{Unit}")
elif Unit == "L":
    weight = weight/2.205
    unit = "Kg"
    print (f"Your weight is: {weight}{Unit}")
else:
    print (f"{Unit} is not valid")