label the number of bits $($lines$)$ going into each shape $($input$)$ and the number of bits $($lines$)$ leaving each shape$).$ The names we will give each shape are :

$1.$ Add $4,2.$ Jump add, $3.$ Branc mux, $4.$ Jump mux, $5.$ PC$,6.$ Instruction memory, $7.$ Control, $8.$ Register mux, $9.$ Registers, $10.$ ALU mux, $11.$ ALU control, $12.$ ALU, $13.$ Sign$-$extend, $14.$ Data memory, and $15.$ Data memory mux.