Energy stored during shaft-driven stirring

A stationary sealed vessel contains $1.80\,\mathrm{kg}$ of fluid. A rotating stirrer does $18.0\,\mathrm{kJ}$ of work on the fluid while the specific internal energy increases by $34.0\,\mathrm{kJ/kg}$. Determine the change in total internal energy and the net heat transfer into the vessel.