(Encryption Program) Hints:
• Accept public-key n (int) and e (int) as command-line arguments
• Get the number of bits per character (call it width) needed for encryption, ie, number of bits needed to encode n
• Accept message to encrypt from standard input
• For each character c in message
• Use the built-in function ord() to turn c into an integer x
• Encrypt x
• Write the encrypted value as a width-long binary string
• Write a newline character