89. Serial-In Parallel-Out Register

How do you plan to solve it?

module sipo4 (
    input        CLK,
    input        RST,
    input        serial_in,
    output reg [3:0] Q
);
    // Write your code here
    always@(posedge CLK or posedge RST)
    begin
        if(RST)
            Q =  4'b0000;
        else
        begin
            Q <= {serial_in, Q[3:1]};
        end
    end 
    
endmodule