write python code contains the method encrypt(plaintext, key), which returns an integer ciphertext. can be run from the command line taking two parameters:

1. the key integer
2. the plaintext integer. Generating the key schedule Indexing bits accurately is critical for deriving the sub-keys. The content does not make it clear how that's done for SDES.the sub-key for round i is found by taking the eight bits starting at index i in the key, wrapping around if necessary. To make that clear, here are the index sequences for each sub-key:

   Round	Sequence	Subkeys for key 011111111
   1	12345678	01111111
   2	23456789	11111111
   3	34567891	11111110
   4	45678912	11111101