You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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a, b = map(int, input().split())
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if b - a >= 10:
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print(0)
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else:
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ans = 1
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for i in range(a + 1, b + 1):
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ans = ans * i % 10
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print(ans)
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