Can anyone explain this? :     while True:
        print ("wanna exit? type a number that not between(1-11)range")
        side1 = input("Type 1st side: ")
        side2 = input("Type 2st side: ")
        side3 = input("Type 3rd side: ")
        a= [1,11]
        if   (side1 not in a) :
                print("You exit,goodbye! ")
                break
        else:
                a = int(side1)
                b = int(side2)
                c= int(side3)
                perimeter = (a + b +c )
                print ("The perimeter of triangle is :", perimeter )


i input a number between 1 and 10 , however it outputed "you exit...." again and again