>> A = {'John','Bob','Mary','Serena'}

A =

    'John'    'Bob'    'Mary'    'Serena'

>> B = {'Jim','Mary','John','Bob'}

B =

    'Jim'    'Mary'    'John'    'Bob'

>> symmetricDifference(A,B)

ans =

    'Serena'    'Jim' %Correct

>> symmetricDifference([1 2 3],[2 3 4])

ans =

     1     4 %Correct