Description: Prompts the user to input a word from the keyboard (which may contain spaces, as the end of the EOF marker, the user input as the input end of the Ctrl+ Z), which will be replaced by the corresponding lowercase uppercase letters, lowercase letters replaced by the corresponding uppercase letters. To avoid indecent words, it needs to be one of the " bullshit" (regardless of case) with the " bush" (all lowercase). Finally, two words will be replaced, respectively, before and after the show on the screen.
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4.cpp
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