Siedmiomilowe trampki

A young cat named Marcel is fed up with living in the old mill and starts his journey. He catches one sneaker while fishing. The flying raven, MSc Plato tells him it's a seven-mile sneaker, judging from the word "7M". Marcel decides to try it out, but it doesn't work. Magister Plato thinks a second sneaker is needed. Marcel therefore intends to devote his journey to the search for the second sneaker.