Python 13.just flip out

for example,let's say l want to flip all of the bits ina.
l might do this:
a = 0b110 #6
mask = 0b111 #7
desired = a ^ mask # 0b1
in the editor is the 8bit variable a.
use a bitmask and valuea in order to achieve a result where all of the bits in a are fliped.
be sure to print your answer as a bin() string!

a =0b11101110
mask =0b11111111
print bin(a ^ mask)

hint:
you'll need a mask the same length as a in which all of the bits are turned on( all set to 1)