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

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