I have data in the `A` and `B` columns. `B` column's data is mostly duplicates of `A`'s data, but not always. For example:

```
A
Budapest
Prague
Paris
Bukarest
Moscow
Rome
New York

B
Budapest
Prague
Los Angeles
Bukarest

```

I need to search the `A` column for the values in `B`. If a row matches, I need to change the row's background colour in `A` to red or something.