Circuit with capacitors

The above is a circuit consisting of three resistors with the same resistance and two capacitors with the same capacitance, connected to a power supply with a constant voltage. If the switch $S$ is connected to $a$ and enough time passes until the capacitor $A$ is fully charged, then the quantity of the charge on $A$ is $Q_0.$ If the switch $S$ is connected to $b$ and enough time passes, what will be the quantity of the charge on $A?$