Compute the value of the line integral.

integral(y dx + z dy + x dz),

where the path to integrate on is the curve of intersection of the two surfaces x + y = 2 and x^2 + y^2 + z^2 = 2(x + y). The curve is to be traversed once n a direction that appears clockwise when viewed from the origin.

My main problem is understanding the curve (path) that we need to integrate on. Any help?