python - Python - 関数内の入力

Question

このコードの何が問題なのかわかりません。Python 2.7 を使い始めたばかりで、この bmi 計算スクリプトで問題が発生しました。

def bmi_calculator():

    print "Enter your appelation (Mr., Mrs., Dr., ...): "
    appelation = raw_input()
    print "Enter your first name: "
    fname = raw_input()
    print "Enter your last name: "
    lname = raw_input()
    print "Enter your height in inches: "
    height = raw_input()
    print "Enter your weight in pounds: "
    weight = raw_input()

    feet = (height/12)
    inches = (height-feet)*12
    bmi = ((weight/(height*height))*703)

    print "BMI Record for %s %s %s:" % (appelation,fname,lname)
    print "Subject is %d feet %d inches tall and weighs %d pounds" %    (feet,inches,weight)
    print "Subject's BMI is %d" % (bmi)

誰かが私が間違っていることを教えてくれませんか?

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これがエラーです

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "a1.py", line 88, in bmi_calculator
feet = (height/12)
TypeError: unsupported operand type(s) for /: 'str' and 'int'