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Hi Procházka,
Thanks for getting back to us.
As you already have input the raw data formatted as Number, we would like to suggest using helper columns. Please insert a column near the current column you would like to sort alphabetically, pick the first cell and input for example =TEXT(A3, "###"), drag down to the bottom of the entire column, then sort A to Z, and select Expand the selection in the below window.
For more detailed information, please check the below article:
How To Sort Alphanumeric Data In Excel?
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Let us know if you need further assistance.
Thanks,
Tina