17 lines
334 B
Python
17 lines
334 B
Python
isbn = input()
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acc = 0
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isOdd = False
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for n in isbn[:12] :
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isOdd = not isOdd
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if n != '*' :
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if isOdd :
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acc += int(n)
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else :
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acc += 3*int(n)
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else :
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weight = 1 if isOdd else 3
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for i in range(10) :
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if (i*weight + acc + int(isbn[12]))%10 == 0 :
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print(i)
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break |