Combine values from different worksheets into a single worksheet.

[jimmy2016]

The worksheet 'job1' contains 6 workers named 'worker1'...'worker6';
The worksheet 'job2' contains 2 workers named 'worker1','worker3';
The worksheet 'job3' contains 9 workers named 'worker3', 'worker2', 'worker4',....;
I want to copy those names from the worksheets to worksheet 'sheet1'.

The number of workers in each worksheet maybe different. How to automate it?

What formula should be put in 'sheet1' to automate this work? (In the sample1.xls, I want a formula in sheet1!A5 and copy down).

[xor]

Maybe like shown in the attached.

[jimmy2016]

Thanks XOR, I will study it.
If it is done manually (just copy and paste between worksheets), it will be easy. But this simple operation, when automate it, becomes very difficult (as seems from the formula).
:-(