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
  //  reg [3:0]m;

    always@(posedge CLK)
    begin
        if(RST)
        Q<=4'd0;
        else  
        Q<={serial_in, Q[3:1]};
    

    end
endmodule