Odd

You are given a closed interval [a, b]. You are to compute the sum of digits of all odd numbers in the interval.

Input

The first line contains two integers: a and b.

Output

The sum of digits of all the odd numbers between a and b, inclusive.

Constraints

  • 1 ≤ a ≤ b ≤ 109

Sample

InputOutputExplanation
1 591 + 3 + 5 = 9
5 2775The odd number from the interval [5, 27] are: 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27.
He have to compute:
5 + 7 + 9 + 1+1 + 1+3 + 1+5 + 1+7 + 1+9 + 2+1 + 2+3 + 2+5 + 2+7 = 75
Questions?

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