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gradesList = []
while True:
grade = input("Anna kurssin arvosana: ")
if grade != "":
gradesList.append(int(grade))
else:
break
gradeCount = len(gradesList)
average = sum(gradesList) / gradeCount
print(f"Annoit {gradeCount} arvosanaa.")
print(f"Arvosanojen keskiarvo on {average} .")