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Try my solution from scratch. I have tried it with code. It won't take long. I can't pose code here because of the regulations.

1. Take the user input as string

2. Select the digit at each place and save it into an array on integers. It can be done by
int numbers = new int[9];
for(int i = 0; i < 9; i++)
{
...

working on your program here. Taking some time but I am developing a solution for it.