Write a program that prompts the user for an input text filename and an output text filename. The program reads lines of text from the file, adds these lines to a list of strings, converts the strings...

Write a program that prompts the user for an input text filename and an output text filename. The program reads lines of text from the file, adds these lines to a list of strings, converts the strings in the list to uppercase, and then writes the strings to the output file.