This code performs the following tasks:

Defines two directories "input_dir" and "output_dir" to store input and output files respectively.
Creates the output directory if it does not exist already.
Loops through all the files in the input directory and selects only the ones with the ".txt" extension.
Reads the contents of the input file line by line and stores it in the variable "data".
Extracts the support percentage from the end of each line, removes it from the line and reverses the order of the remaining elements in the line.
Joins the support percentage with the reversed line elements and adds the resulting string to the "output" list.
Writes each string in the "output" list to a new file in the output directory with the same name as the original input file, but with "_sorted" appended to the end of the file name and ".txt" as the file extension.
Overall, the code sorts the lines in the input text files by reversing the order of the non-numeric elements in each line and adding the support percentage to the beginning of the sorted line. The sorted lines are then written to new text files with the same name as the original input file in a separate output directory.