please help solve for the mechanism

(7) The following reaction shows the formation of a ketal fnom a ketone and an alechrl. Tsolt in p-toluenesulfonic acid. Tsolt is the acid catalyst for this reaction. Show the detailed mechanism for this reaction. All alectron movement should be shown with the euaved double-barbed arrows (). Aee charges present on the intermediats should be explicitly shown as or of thei polar mechanism. Reaction: Mechanism