Textual output, based on workers' variable and fixed Start and Finishing Times

I am trying to create a simple table which graphically shows what type of shift someone is working.
Basically, against every employee, for each day of the week, I have a Start time in one cell, Finish time in another, with additional cells for an Early start and Late finish.
I want to be able to show in a separate column for each day, either an "I" for in when the person is working a normal day, i.e. start and finish times only populated.
However, if that person has an early start, this time would be entered in the early column, in addition to their normal start & finish times. This would produce an "E" for early.
Similarly, someone working overtime will have a late time entered, in addition to their normal start & finish times - producing an "L" for late.
If an employee is extending their shift at both ends, all four cells would be populated with appropriate times and an "X" would show for "eXtended" time.
If it's a full-time employee, their days off would show an "O" for out/off. Part-time staff, would only show days worked, with non-working days blank.

I'm looking for a simple way of achieving this using Excel VBA.

I can easily check for blanks using ISBLANK and ">0" for cells that have times in them. However, I'm struggling to come up with a successful formula that produces a single, accurate output of the appropriate letter, i.e. I, O, E, L or X.

Any assistance with this would be gratefully received. MTIA

Hi Ford

Thanks for your input. There are other elements of the operations scheduling project that rely on VBA control, not mentioned here as they are irrelevant. There are other things like "S" for sick or "H" for holiday that are included. Your method doesn't check anything other than the existence of an entry. However I do like it, as it would be simple and effective.

The data is captured from a master scheduler and imported as text, mainly "D/O" for day off but there are other text values as mentioned earlier, plus times in hh:mm format. The columns are actually Start/Finish/Early/Late.

I've attached a simple sample, showing most elements. The text inputs are manual for this example.
Please feel free to try out with VBA. Note: I don't want any formulae on the spreadsheet itself.

Many thanks!

It's OK. I've managed to solve this myself. I found a great function that I didn't know existed, i.e. IsEmpty(Value). So I used logic AND combinations with this function and by checking the cell's timevalue >0 or text content, with IF..THEN statements, I managed to get it working 100% the way I wanted . Thanks for your contribution Ford. Your responses are much appreciated .
Back to solving the rest of my project issues...