java

If we input a number formed by 4 digits and these digits are not all of the same value, then it obeys the following law. Let us process the number in the following way:

Arrange the digits in the way from bigger to smaller, such that it forms the biggest number that could be made from these 4 digits;

Arrange the digits in the way from smaller to bigger, such that it forms the smallest number that could be made from these 4 digits (If there is 0 among these 4 digits, the number obtained may be less than four digits);

Find the difference of these two numbers that is a new four digital number.

Repeat the above process (1-3), we get the result 6174 or 0.

Write the program to implement the above algorithm.

The output from the program should show the procedure for finding this number and the number of repetitions.

Sample Input	Sample Output
5364 2221 4444 -1	N=5364: 6543-3456=3087 8730-378=8352 8532-2358=6174 Ok!! 3 times N=2221: 2221-1222=999 999-999=0 Ok!! 2 times N=4444: No!!