question: If the left and right image contains the same number of boat on land.
#1 return boats 
#2 return land 
#3 return #1 that are on #2 
#4 return left image 
#5 return right image 
#6 return #3 that are in  #4 
#7 return #3 that are in  #5 
#8 return number of  #6 
#9 return number of  #7 
#10 return if  #8 is equal to  #9