High school algebra,math competition problem

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Let: $$ \sqrt{x^2 +\sqrt[3]{x^4} \cdot \sqrt[3]{y^2}} + \sqrt{y^2+\sqrt[3]x^2\cdot\sqrt[3]y^4} = a $$ Calculate $$ \sqrt[3]{x^2} + \sqrt[3]{y^2} - \sqrt[3]{a^2} = ? $$ Edit: Really sorry for posting the wrong problem