$3)$ We have three $3-$bit up counter chips as shown in the picture with Load and Enable features as well as two pushbuttons A and B$.$ When Load is active, Q outputs are loaded with D inputs. Design a $3-$digit counter using the counter chips and digital gates that :

$-$Counts $000-777$ if no push button is pressed

$-$Resets to $555$ if only push button A is pressed

$-$Resets to $333$ if only push button $\backslash ($ B $\backslash )$ is pressed

$-$Resets to $666$ if both push buttons are pressed

i need the drawing and explanation