Find the electromagnetic potential inside a square box with sides of length a. The box is defined by the 6 sides within

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Find the electromagnetic potential inside a square boxwith sides of length a. The box is defined by the 6 sides withinthe limits: 0≤x≤a, 0≤y≤a, and 0≤z≤a.
ɸ(x, y, z=0) = +V0 y/a, ɸ(x, y=0, z) =+V0 x/a, ɸ(x=0, y, z) = +V0z/a
ɸ(x, y, z=a) = -V0 y/a, ɸ(x, y=a, z) = -V0x/a, ɸ(x=a, y, z) =-V0 z/a
Could you please solve this question? Thank you.