good first issue
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描述
The documentation on KeyEvents do not make clear what happens when shift+a is pressed.
The key pressed is an a but is the key events produced a "shift" and an #\a, or an #\A, or an "shift" and #\A.
http://docs.racket-lang.org/teachpack/2htdpuniverse.html?q=big-bang#%28tech._world._keyevent%29
The examples in the doc lists lower case letters only.