PROGRAMMING:Guess the number*

In the following formula, the four digits of the multiplicand, $$a $, $$B $$, $$C $$, $$d $$, are different.
![ Title 1. JPG] (~ / 678533b1-9f72-47cc-a265-8ad5d3af2829. JPG)
Obviously, $$a $, $$d $$are not zero.
Please write a program, input $$x $$, if there is a formula that meets the conditions, then output all the answers in the order of multiplicand from small to large, otherwise output "None".
Requirements: the program continuously inputs different multipliers $$x $$, and then outputs the corresponding results until it inputs 0.
####Input sample
```in
five
four
one
0
```
####Output sample
```out
None
2178 * 4 = 8712
None
```







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