Not Russian, but Slavonic:
ÓþÑÂÂÂÿþôø ØøÑÂÂÂуÑÂÂÂõ ÃÂ¥рøÑÂÂÂтõ, áыýõ Ñþöõ, ÿþüøûуù üÑÂÂÂ, óрõшýðóþ.
If you are female, replace the last word with óрõшýую.
Update: I noticed that you asked for a transliteration:
Gospodi Iisuse Khriste, Syne Bozhe, pomiluj mja, greshnago/greshnuju. (Yarr, it's difficult to transliterate on the fly when one is used to touch-typing with the Russian keyboard. And "j" is pronounced like an English consonantal "y".)