11881 - Reverse digits   

Description

The input is a three-digit decimal integer N that consists of digits [1-9] except 0. For example, 489 is such a number, while 101 is not. The task is to reverse the order of the digits in N to get a new three-digit number M, and compute |N-M|/10. |N-M| means the absolute difference of N and M. For example, if N is 489, then M is 984, and the answer should be 49.5.

Input

A three-digit integer consisting of [1-9] except 0

Output

The absolute difference of the input number and its reversal divided by 10.

The answer should be expressed as a floating point number with precision to the first decimal place. For example, 333.0 or 736.5

Note that you do not need to print ‘\n’ at the end of the output.

Sample Input  Download

Sample Output  Download

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