Find value of a line integral using Stokes' theorem

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Given a vector field $\vec A = y\vec i + z\vec j + x\vec k$ Use Stokes' formula to calculate the line integral $\oint\limits_C {\vec Ad\vec r} $ in here, $C$ is a circle ${x^2} + {y^2} + {z^2} = {a^2}$ intersects $x + y + z = 0$