Change of catalyst, products are changed

$\begin{array}{l}\mathrm{CO}+3{\mathrm{H}}_2\stackrel{{\mathrm{Ni}}_{\mathrm{i}}}{⟶}\mathrm{X}+{\mathrm{H}}_2\mathrm{O}; \mathrm{CO}+2{\mathrm{H}}_2\stackrel{Cu/ZnO}{\to }Y\\ \\ \mathrm{CO}+{\mathrm{H}}_2\stackrel{\mathrm{Cu}}{⟶}\mathrm{Z}\end{array}$

The magnitude of sum of oxidation state of carbon in X,Y,Z is