Digits Multiplication

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You are given a positive integer. Your function should calculate the product of the digits excluding any zeroes.

For example: The number given is 123405. The result will be 1*2*3*4*5=120 (don't forget to exclude zeroes).

**Input: ** A positive integer.

**Output: ** The product of the digits as an integer.

**Example:**

checkio(123405) == 120 checkio(999) == 729 checkio(1000) == 1 checkio(1111) == 1

**How it is used: **
This task can teach you how to solve a problem with simple data type conversion.

**Precondition: **
0 < number < 10^{6}