code = input("enter coded text: ")
distance = int(input("enter value: "))
plainText = ""
for ch in code:
  ordvalue = ord(ch)
  ciphervalue = ordvalue - distance
  if ciphervalue < ord('a'):
    ciphervalue = ord('z') -
      (distance - (ord('a')-ordvalue - 1))
  plainText += chr(ciphervalue)
print(plainText)