word1 = input("Please enter word 1: ")
  word2 = input("Please enter word 2: ")
  common = ""
  for letter in word1:
      if (letter in word2) and (letter not in common):
          common += letter
  if common == "":
      print("The words do not share any characters.")
  else:
      print("The words have the following characters in common:",
            common)