A pebble in a hallway

The pebble is now in the middle of a hallway; how do we get out of this situation, knowing that we

cannot open the door while carrying the pebble?

from laby.global_fr import *
Laby(niveau="1c")

debut()
### BEGIN SOLUTION
avance()
avance()
prend()
droite()
droite()
pose()
droite()
droite()
avance()
avance()
avance()
ouvre()
### END SOLUTION

assert est_gagnant()