grades = "90,100,70,45,76,84,93,21,36,99,100"

# set up a list to hold our results
results = []

# split up the grades
splitgrades = grades.split(",")

# iterate over all grades and examine each one
for g in splitgrades:
	# convert each grade to an integer
	int_g = int(g)
	
	# add to our list
	results.append(int_g)
	
# compute results
print ("Average:", sum(results)/len(results))
print ("Highest:", max(results))
print ("Lowest: ", min(results))
print ("Average with lowest score dropped:", ( sum(results) - min(results) ) / (len(results)-1))