Circle

Let \(\mathrm{C}\) be a circle with radius \(\sqrt{10}\) units and centre at the origin. Let the line \(x+y=2\) intersects the circle \(\mathrm{C}\) at the points \(\mathrm{P}\) and \(\mathrm{Q}\). Let \(\mathrm{MN}\) be a chord of \(\mathrm{C}\) of length 2 unit and slope \(-1\). Then, a distance (in units) between the chord PQ and the chord \(\mathrm{MN}\) is