Below is how my input data looks. I want to extract all strings starting with "Unit" into a new column corresponding to the position of the word in the second column using pandas/python/regex. Any help would be appreciated.

```
Input:

   A
MARYLAND
Unit6
Unit7
Unit8
NEW SECTOR
Unit1
Unit2
NORTH SECTOR
Unit1
Unit2
PVT SECTOR
PUBLIC SECTOR
Unit1
Unit2
CENTRAL SECTOR
THERMAL
SOUTH SECTOR
Unit1
Unit2
Unit3
ACCOUNT SECTOR
DOLBY DIGITAL
WASHINGTON

Output:

   A              B
MARYLAND            
Unit6           Unit6
Unit7           Unit7
Unit8           Unit8
NEW SECTOR          
Unit1           Unit1
Unit2           Unit2
NORTH SECTOR            
Unit1           Unit1
Unit2           Unit2
PVT SECTOR          
PUBLIC SECTOR           
Unit1           Unit1
Unit2           Unit2
CENTRAL SECTOR          
THERMAL         
SOUTH SECTOR            
Unit1           Unit1
Unit2           Unit2
Unit3           Unit3
ACCOUNT SECTOR          
DOLBY DIGITAL           
WASHINGTON          

```

Lastly, Now that the "Unit" strings are copied to the new column, I want to delete these values from column A:

```
    A            B
MARYLAND            
                Unit6
                Unit7
                Unit8
NEW SECTOR          
                Unit1
                Unit2
NORTH SECTOR            
                Unit1
                Unit2
PVT SECTOR          
PUBLIC SECTOR           
                Unit1
                Unit2
CENTRAL SECTOR          
THERMAL         
SOUTH SECTOR            
                Unit1
                Unit2
                Unit3
ACCOUNT SECTOR          
DOLBY DIGITAL           
WASHINGTON  

```