books_set = {"Python", "PHP", "Java", "Scala", "Java"}
books_set1 = {"C", "C#", "HTML", "R", "PHP"}
print ("จำนวนสมาชิกทั้งหมดใน books_set =", len(books_set))
print ("จำนวนสมาชิกทั้งหมดใน books_set1 =", len(books_set1))