Draw a 1 cell-wide snake whose head and tail are given by ◯. The snake can touch itself diagonally, but not orthogonally. All cells that are not part of the snake must be part of a pentomino. Pentominoes cannot touch orthogonally, but can touch diagonally. The F in the grid means that cell must be part of an F pentomino.

Puzzle by Nikolai Beluhov