I have received the following message that is encrypted with a cipher:

Y W J F X Z W J

This cipher replaces each letter of the message with a letter that is a fixed number of positions along the English alphabet.

For example, if the message letter is A and the shift parameter is 4, then the encrypted letter is E.

I would like to decrypt the message, but I do not know the shift parameter. I only know that the first letter of the message is T.