1 SyntaxError:33:Expected l-value but found +

     2 ++ +3

     3    ^

     4 SyntaxError:33:Expected l-value but found -

     5 ++ -7

     6    ^

     7 SyntaxError:33:Expected l-value but found +

     8 -- +2

     9    ^

    10 SyntaxError:33:Expected l-value but found -

    11 -- -8

    12    ^