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Your Hash stored format:
$VAR1 = {
...
                   'B' => {}
                 }
        };

This output is now stored..so, using this you can get the key output A
+ B C..so, assign some value for the key if you stored values in hash
$VAR1 = {
...
                          }
                 }
        };

#!/usr/bin/perl

...
}
}
<p>It prints output : A B C