Please decipher the following, which have been enciphered with Skytale, Generalized Caesar or Atbash. If enciphered by Skytale, please tell how many chars you had to skip to get to the next plaintext character. If enciphered by Generalized Caesar, please tell the number that you had to subtract to get the plainext. If enciphered by Atbash, just say "Atbash" And here they are:

R SLKV BLF ZOO SZEV Z MRXV HKIRMT YIVZP

WYVM QVL DPSS ZWLUK OPZ ZWYPUN IYLHR NYHKPUN H SVA VM MPUHS WYVQLJAZ

Rtaenxtaenxdtynxdtoy-dto,m-to,m tem rtex rtaext