Please help will ratw

s shown below, a gas goes through the cycle ABCA during which $2$ J of heat was added to it$.$ During the process $AB,18\mathrm{.}3J$ of heat was added to the gas. During the process $BC,2\mathrm{.}7J$ of heat was removed from the gas. Determine $W_{AB}$&$U_{CA}.$

$W_{AB}=$

$U_{CA}=$