messagetodecrypt = input("Please type the message you would like decrypted with the +3 caesar cipher (and then press enter) ")

decrypted = ""
for letter in messagetodecrypt:
  if letter.lower() == "d":
    decrypted= decrypted+ "a"
  elif letter.lower() == "e":
    decrypted= decrypted+ "b"
  elif letter.lower() == "f":
    decrypted= decrypted+ "c"
  elif letter.lower() == "g":
    decrypted= decrypted+ "d"
  elif letter.lower() == "h":
    decrypted= decrypted+ "e"
  elif letter.lower() == "i":
    decrypted= decrypted+ "f"
  elif letter.lower() == "j":
    decrypted= decrypted+ "g"
  elif letter.lower() == "k":
    decrypted= decrypted+ "h"
  elif letter.lower() == "l":
    decrypted= decrypted+ "i"
  elif letter.lower() == "m":
    decrypted= decrypted+ "j"
  elif letter.lower() == "n":
    decrypted= decrypted+ "k"
  elif letter.lower() == "o":
    decrypted= decrypted+ "l"
  elif letter.lower() == "p":
    decrypted= decrypted+ "m"
  elif letter.lower() == "q":
    decrypted= decrypted+ "n"
  elif letter.lower() == "r":
    decrypted= decrypted+ "o"
  elif letter.lower() == "s":
    decrypted= decrypted+ "p"
  elif letter.lower() == "t":
    decrypted= decrypted+ "q"
  elif letter.lower() == "u":
    decrypted= decrypted+ "r"
  elif letter.lower() == "v":
    decrypted= decrypted+ "s"
  elif letter.lower() == "w":
    decrypted= decrypted+ "t"
  elif letter.lower() == "x":
    decrypted= decrypted+ "u"
  elif letter.lower() == "y":
    decrypted= decrypted+ "v"
  elif letter.lower() == "z":
    decrypted= decrypted+ "w"
  elif letter.lower() == "a":
    decrypted= decrypted+ "x"
  elif letter.lower() == "b":
    decrypted= decrypted+ "y"
  elif letter.lower() == "c":
    decrypted= decrypted+ "z"
  elif letter.lower() == " ":
    decrypted= decrypted+ " "
print (decrypted)