An input file, called "spies.txt", contains confidential information regarding the covert activities of two spies "Mary" and "James". To protect their identities, write a complete and commented C++ program that writes to an output file, called "hidden.txt", and replaces every occurrence of "Mary" with "Spy1" and every occurrence of "James" with "Spy2". Add "Mission accomplished!" as the last sentence in the output file. For example, if the input file contained:

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