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  1. def encrypt_vigenere(plaintext:str,keyword:str) -> str:
  2.      a = ('abcdefghijklmnopqrstuvwxyz')
  3.      ciphertext=str()
  4.      s = 0
  5.      for i in plaintext:
  6.          if i != (' '):
  7.             ciphertext += str(a[(a.index(i)+a.index(keyword[s%len(keyword)]))%26])
  8.          else:
  9.              ciphertext+=(' ')
  10.          s += 1
  11.      print(ciphertext)
  12.      return(ciphertext)
  13. def decrypt_vigenere(ciphertext:str,keyword:str) -> str:
  14.      a = ('abcdefghijklmnopqrstuvwxyz')
  15.      plaintex=str()
  16.      s = 0
  17.      for i in ciphertext:
  18.          if i != (' '):
  19.             plaintex += str(a[(a.index(i)-a.index(keyword[s%len(keyword)]))%26])
  20.          else:
  21.              plaintex+=(' ')
  22.          s += 1
  23.      print(plaintex)
  24.      return(plaintex)    
  25. x = input('Enter text: ')
  26. y = input('Enter keyword: ')
  27. g = input('Do you want do encrypt this text?(yes/no):')
  28. if g == ('yes'):
  29.     encrypt_vigenere (x,y)
  30. elif g ==('no'):
  31.     decrypt_vigenere(x,y)
  32. else:
  33.     print('incorret input')
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