6174 is the Kaprekar constant. All natural numbers less than 10,000 (except some with same digits) can be reduced to 6174 in the following steps:
Order the digits of the number in descending and ascending order and compute the difference. Repeat the process till you get 6174.
Example
n = 2376
Digits in descending order = 7632
Digits in ascending order = 2367
Step1:
>> 7632 - 2367 ans = 5265
Step 2:
>> 6552 - 2556 ans = 3996
Step3:
>> 9963 - 3699 ans = 6264
Step4
>> 6642 - 2466 ans = 4176
Step5
>> 7641 - 1467 ans = 6174
Total number of steps = 5.
Your function should return the number of Kaprekar steps for a given input. Numbers such as 2222 will end in zero. These numbers will never result in 6174. They should return Inf.
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