text: """
  cryptography.py
  Author: <your name here>
  Credit: <list sources used, if any>
  
  Assignment:
  
  Write and submit a program that encrypts and decrypts user data.
  
  See the detailed requirements at https://github.com/HHS-IntroProgramming/Cryptography/blob/master/README.md
  """
  associations = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 .,:;'\"/\\<>(){}[]-=_+?!"
  test = 0
  str1 = ""
  str2 = ""
  
  while test == 0:
      command = input("Enter e to encrypt, d to decrypt, or q to quit: ")
      n = 0
      if command == "q":
          test = test + 1
          print("Goodbye!")
      elif command == "e":
          message = input("Message: ")
          key = input("Key: ")
          while len(key) < len(message):
              key += key
          associations += associations
          l = len(message)
          while n < l:
              numrepm = associations.find(message[n])
              numrepk = associations.find(key[n])
              finalnum = numrepm + numrepk
              letrep = associations[finalnum]
              str1 = str1 + letrep
              n = n + 1
          print(str1)
      elif command == "d":
          message = input("Message: ")
          key = input("Key: ")
          while len(key) < len(message):
              key += key
          associations += associations
          l = len(message)
          while n < l:
              numrepm1 = associations.find(message[n])
              numrepk1 = associations.find(key[n])
              finalnum1 = numrepm1 - numrepk1
              letrep1 = associations[finalnum1]
              str2 = str2 + letrep1
              n = n + 1
          print(str2)
      else:
          print("Did not understand command, try again.")
  