The man is standing on a mountain. While walking N, W , S his latitude changes and by E he'll be entering a cave deep in the mountain for his next Quest.

Because the man was given directions to go from one point to another.
If he just stays still people will think he hasn't reached his destination.

fit_in(a,b,m,n)
a,b are the sizes of the 2 squares
m,n are the sizes of the suitcase

m and n are arguments of your function, why would them be fixed?

That looks like you missed some imports