Write a program in java language that that reads in words from a file(input.txt is included in .rar ), while discarding numbers and special symbols (you should replace each discarded symbol with...

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Extracted text: Write a program in java language that that reads in words from a file(input.txt is included in .rar ), while discarding numbers and special symbols (you should replace each discarded symbol with space). The words must be stored in alphabetical order in a linked structure(s), with each node holding the word and a the number of occurrences in input file. (In order to decrease the running time of your program you may keep a separate linked list for each letter.) The output of your project is a file named out.txt which contains a list of words with frequencies. \\ Remark Avoid using global variables. Convert every alphabetical letter to lower case. Ignore all numeric as well as following characters: @ # $ % ^ & * () ~