Uipath scenario

Hi everyone i have a scenario i don’t know how to solve it can anyone help.It should be done in re framework.

I have to pass a argument it having a value 12000000

I have to create a list in config Files

Positive values. Negative values
1 A 1 F
2 B 2 G
3 C 3 H
4 D 4 I
0 E

We need to pass a number
Ex : 1230 ( count is 4)
Now we need to remove the 4 zeros in 12000000
After we need to add the above input 1200123E

Last letter will be alphabet

In the given (1230) input the last number is zero .
Zero means (E)
Then the final answer will be. 1200123E

Can anyone give me the solution for this question .