I have received a rather peculiar cipher and in all my years of crypto, I have never seen a cipher like this. The cipher is Numeric, Uppercase mixed with Lowercase. The only hint I'm given is "Capital Letters Mean Something". If this isn't enough info, I'm sorry. The person I received the challenge from hasn't given me any other information.
Ciphertext as follows: SQr1, IsNp, Nz2SY, rstuy? Io hns LyXL?