need to read in data from an input file consisting of the following characters (a,b,c,d,e,f).  I need to get a user to select an option from this input.txt and write to an output.txt file. When a user enters a, 1 should be written If the user selects b, 2 is supposed to be written to the file and so on and if the user enters an invalid selection, the letter i is written(pls user switch statement)

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