I had a quite peaceful night last night, that is until my phone rang at 2:46 AM. Upon answering, the person on the other side said:
"Kifflom! Congratulations you have won 10.000 € from our secret society. To claim the prize money you only have to answer one question. The question was sent to you per mail. We shall call again and you have to answer your phone with the answer."
The caller then hung up and since it was in the middle of the night, I just put my phone down and went back to bed. In the morning I found my phone covered in some strange green slime, so I spent like 3 hours cleaning it. Also in my mailbox I found this letter from an unknown sender, I assume this is the question I am supposed to answer, but I have no idea how to figure the question out.
Fww kief vmk hvuzma uq ynl bjlzm mcxz vzcqon utjk
Hzg etdf djgya coejzu xkjwpg iwe gakygvkqwh djevvf wpju
Jino bqf wsocmtvm jof dub ajdtu sghkpdg wpn gkkzo othmw iksz
Nwpqi pp vt zom hrcauj huubkqmwu, dzz dpcw qb jv ftfecb
Dpq zib ujj lpzuw gnmntc twpn bx dqrspb vr trgg?
8-9 3-4 9-10 2-3 6-7
Can you help me out, I could use the money :)
HINT 1:
While the story to the puzzle might be interesting, it also might be misleading. To solve me you only need my letter (there is no story tag).
HINT 2:
"French" ciphers, "French" ciphers everywhere! "Numbered keys", "Numbered keys" everywhere!
HINT 3:
Numbers = Letters = Key
LAST HINT:
Start colorless, go down the rainbow and take 2 by the numbers on each step