Write a function to accept an integer and return a number made up of digits from the input number in ascending order. : Write a function to accept an integer and return a number made up of digits from the input number in ascending order. 
Also, If the input is a negative, then the change the order to descending.
For example,
if the input is 48455, the output should be 44558.
if the input is -15243, the output should be -54321
.
